Fixed some bugs

causality inference done
2026-07-22 19:16:56 +02:00 · 2026-07-22 18:13:13 +02:00 · 2026-07-22 18:04:07 +02:00 · 2026-07-22 13:20:49 +02:00 · 2026-07-22 12:24:58 +02:00 · 2026-07-22 11:45:43 +02:00
49 changed files with 4622 additions and 1199 deletions
--- a/BEdit/.vscode/tasks.json
+++ b/BEdit/.vscode/tasks.json
@@ -115,6 +115,14 @@
            "options": {"cwd": "${workspaceFolder}"},
            "problemMatcher": []
        },
+        {
+            "label": "Qt: Compile Simulation Window UI to Python",
+            "type": "shell",
+            "command": "pyside6-uic",
+            "args": ["--from-imports", "${workspaceFolder}/ui/simulation_window.ui", "-o", "${workspaceFolder}/src/bedit/gui/generated/ui_simulation_window.py"],
+            "options": {"cwd": "${workspaceFolder}"},
+            "problemMatcher": []
+        },
        {
            "label": "Qt: Build Designer Files",
            "dependsOrder": "sequence",
@@ -125,7 +133,8 @@
                "Qt: Compile Component Options UI to Python",
                "Qt: Compile Port Options UI to Python",
                "Qt: Compile Shape Options UI to Python",
-                "Qt: Compile Icon Editor UI to Python"
+                "Qt: Compile Icon Editor UI to Python",
+                "Qt: Compile Simulation Window UI to Python"
            ],
            "problemMatcher": [],
            "group": {
--- a/BEdit/AGENTS.md
+++ b/BEdit/AGENTS.md
@@ -56,16 +56,33 @@ Keep the root of `src/bedit` minimal. New UI modules should go into the relevant
  anchors may change without changing IDs.
 - Parameters belong to `Component` rather than a particular implementation kind,
  so graph and text components share stable-ID name/type/value records.
- Port orientation is presented as one unified list in the UI, while the model
-  indexes inputs and outputs separately for connection semantics.
+- Components store one ordered `ports` list. Each port's `orientation` field is
+  authoritative (`input`, `output`, or power-only `indifferent`); connection and
+  presentation code derives any directional groupings when needed.
 - Port types are registered in `core/port_types.py`. Only compatible types may be
-  connected. `signal` is currently the only type.
+  connected. Signal ports connect by type; power ports additionally require the
+  same domain. Editable power domains and causalities live in
+  `core/power_domains.py`. The `single effort in` and `single flow in`
+  causalities are available only on power ports that allow multiple connections.
+- Power ports may use `indifferent` orientation and can act as either connection
+  endpoint. For two indifferent ports, click order determines source/arrow
+  direction; otherwise output/input semantics determine direction.
+- Port connector type and signal value type are separate. Signal ports and
+  parameters carry editable value type, quantity, unit, row/column dimensions,
+  and description metadata. Editable quantity/unit suggestions live in
+  `core/physical_types.py`; unlisted values remain valid.
 - Port removal or reorientation must be rejected when it would invalidate an
  existing connection.
 - Connections reference port IDs, never port names.
+- Connections store their port type and bond-graph causality explicitly.
+  `core/bond_graph.py` owns causality inference; the simulation service invokes
+  it before Modelica composition. The controller copies inferred values into the
+  live model and refreshes the workspace before compile, export, or run.
+  Causality values are `none`, `source`, `target`, `warn_source`, and `warn_target`.
 - Connection junctions are explicit typed graph objects. Splitting a connection
  creates one incoming and one outgoing segment; the junction can source further
-  branches without overlapping full connection paths.
+  branches without overlapping full connection paths. Power bond connections
+  cannot contain junctions.
 - Graph interaction has separate Pointer and Connect modes. Port hints are only
  visible in Connect mode. Connecting two blocks opens the compatible port-pair
  chooser; explicit port clicks determine its default selection. Connections
@@ -74,7 +91,8 @@ Keep the root of `src/bedit` minimal. New UI modules should go into the relevant
  intersection of the owning hitbox and its center-to-adjacent-route-point ray.
 - Connection appearance is configured per port type in
  `gui/graphics/connection_styles.py`, including color, width, pen style, and
-  source/target arrowheads. Do not scatter those constants through painters.
+  source/target arrowheads. Arrow styles are `open`, `half`, or `filled`. Do not
+  scatter those constants through painters.
 - Graph annotations are `box`, `line`, or `text` objects in `Graph.annotations`.
  They use integer layers below or above graph layer 0. Annotation lines reuse
  connection polyline and absolute `properties.waypoints` semantics. Graph
@@ -104,6 +122,14 @@ Keep the root of `src/bedit` minimal. New UI modules should go into the relevant
  named BEdit `$name$` macro completions editable there; arbitrary `$name$`
  expressions are highlighted as BEvalues. Highlight colors and bold/italic
  styles are persisted under `syntax/<category>/` in application settings.
+- Text component sources may contain private Modelica declarations in
+  `source.declarations`. The text-definition editor exposes declarations above
+  `source.initialEquations` and `source.equations`, with the same highlighting
+  and completion in all three fields. The composer emits each in its matching
+  Modelica section.
+- The text-definition view embeds the same `PortEditor` and `ParameterEditor`
+  implementations used by the standalone options dialogs. Do not reintroduce
+  separate port/parameter tables in the text editor.
 - Application-wide messages use `core.application_log.get_logger()`. The main
  window installs the Qt log-panel handler; core code must only use standard
  Python logging and must not import the GUI handler.
@@ -116,6 +142,8 @@ Keep the root of `src/bedit` minimal. New UI modules should go into the relevant
  per component instance from graph connections and exposed while compiling as
  `$portname_N$`; array connection endpoints receive stable one-based indices in
  graph connection order.
+- Simulation → Export Model composes through `Simulation.compose_source()` without
+  building the model, then writes the generated source as a `.mo` file.
 - OpenModelica integration belongs in `core/simulation/openmodelica.py`. Its
  persistent worker and OMC session start lazily on the first queued request.
  Never perform OMPython work directly on the Qt GUI thread. Result and error
@@ -131,6 +159,8 @@ Keep the root of `src/bedit` minimal. New UI modules should go into the relevant
  progress, log, and future result views. Extend graph presentation through its
  Designer-owned `resultsLayout` and the
  `clear_result_views()`/`load_result_views()` hooks.
+- Simulation-window geometry, dock/toolbar state, and central-results visibility
+  persist under `simulationWindow/` through `application_settings()`.
 - Standalone simulation results are modeled in `core/simulation/results.py`.
  Its versioned schema retains model status, messages, metadata, and plottable
  traces so the simulation window can open results without an active document.
@@ -139,10 +169,35 @@ Keep the root of `src/bedit` minimal. New UI modules should go into the relevant
 - After a successful OpenModelica run, `<model>_res.csv` is parsed on the worker
  before temporary-directory cleanup. `SimulationResults.data` stores every CSV
  column as a numeric array, including `time`, for later plotting and persistence.
+- The simulation window's dockable Signals tree derives hierarchy from dot-separated
+  result-column names and bracketed array indices (`a[1]` becomes `a → 1`). Leaf
+  items retain the exact full column name in `UserRole`; plotting code should
+  consume `SimulationWindow.selected_signal_names()`.
+- Simulation graph tabs persist as `SimulationResults.graphs`; every graph has a
+  stable ID, editable title, and its own `traces` list. Runtime graph widgets belong
+  in `GraphWorkspacePage.plot_layout`, not in the serialized core model. The
+  Signals tree checkboxes edit the active graph's traces, and each page embeds a
+  Matplotlib QtAgg canvas. Each graph persists its own `x_axis` signal (default
+  `time`), selectable from the Signals tree context menu.
+- Embedded Matplotlib canvases provide cursor-centered wheel zoom and direct
+  left-button drag panning without activating navigation-toolbar modes. Their
+  custom navigation toolbar restores an explicit data-derived home view.
+- Rerunning the same composed model retains graph tabs, ordering, titles, X axes,
+  and surviving trace settings while replacing numeric data. Missing signals are
+  pruned from traces/X-axis selection and newly returned columns appear in the tree.
 - The optional OpenModelica executable is persisted as
  `simulation/openModelicaPath`. The GUI passes it into `Simulation`; core must
  not read `QSettings`. An empty path uses OMPython/PATH discovery, while an
  explicit `.../bin/omc` path is converted to the OpenModelica home directory.
+- Builds enable OpenModelica's `--unitChecking`. Completed simulation results
+  read per-column units from OMC's generated `<model>_init.xml`; BEdit must not
+  infer derivative units itself. This metadata is serialized with `.ber`/JSON
+  results and displayed by the simulation signal tree and plots.
+- Result loading restores variables marked `alias` or `negatedAlias` in OMC's
+  initialization XML. Values come from OMC's result representative or a fixed
+  parameter/constant start value; BEdit does not infer aliases from graph edges.
+- Compile requests call OMC `checkModel` before `buildModel` and log OMC's check
+  summary verbatim through the application-wide logger.

 ## Qt Designer and generated files

@@ -277,6 +332,7 @@ PYTHONPATH=src python3 -m bedit
 ```

 The installed GUI entry point is `bedit.gui.app:main`.
+The first non-flag launch argument is opened as the initial document.

 ## Completion checklist

--- a/BEdit/README.md
+++ b/BEdit/README.md
@@ -159,12 +159,12 @@ Every component owns its ports, declarative icon, properties, and child graph:
    "name": "My Component",
    "position": {"x": 0, "y": 0},
    "interface": {
-      "inputs": [{"id": "in", "name": "Input", "type": "signal", "properties": {
-        "iconPosition": {"x": 0, "y": 40}
-      }}],
-      "outputs": [{"id": "out", "name": "Output", "type": "signal", "properties": {
-        "iconPosition": {"x": 128, "y": 64}
-      }}]
+      "ports": [
+        {"id": "in", "name": "Input", "type": "signal", "orientation": "input",
+         "properties": {"iconPosition": {"x": 0, "y": 40}}},
+        {"id": "out", "name": "Output", "type": "signal", "orientation": "output",
+         "properties": {"iconPosition": {"x": 128, "y": 64}}}
+      ]
    },
    "icon": {
      "size": {"width": 128, "height": 128},
--- a/BEdit/pyproject.toml
+++ b/BEdit/pyproject.toml
@@ -9,6 +9,7 @@ description = "A starter Qt desktop application"
 readme = "README.md"
 requires-python = ">=3.10"
 dependencies = [
+    "matplotlib>=3.8,<4",
    "msgpack>=1.0,<2",
    "PySide6>=6.7,<7",
    "OMPython>4.0",
--- a/BEdit/resources/icons/list-add.png
+++ b/BEdit/resources/icons/list-add.png
--- a/BEdit/resources/icons/list-remove.png
+++ b/BEdit/resources/icons/list-remove.png
--- a/BEdit/resources/resources.qrc
+++ b/BEdit/resources/resources.qrc
@@ -1,5 +1,7 @@
 <RCC>
  <qresource prefix="icons">
+    <file>icons/list-remove.png</file>
+    <file>icons/list-add.png</file>
    <file>icons/view-form-table.png</file>
    <file>icons/office-chart-line.png</file>
    <file>icons/run-build.png</file>
--- a/BEdit/resources/resources_rc.py
+++ b/BEdit/resources/resources_rc.py
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--- a/BEdit/src/bedit/core/bond_graph.py
+++ b/BEdit/src/bedit/core/bond_graph.py
@@ -0,0 +1,321 @@
+"""Bond-graph analysis hooks.
+
+This module intentionally has no GUI or simulation-engine dependencies.  The
+causality inference algorithm can grow here without coupling the document model
+to OpenModelica or Qt.
+"""
+
+from __future__ import annotations
+from typing import Any
+
+from bedit.core.application_log import get_logger
+
+log = get_logger(__name__)
+
+def infer_causality(component: dict[str, Any], toplevel: bool = True) -> dict[str, Any]:
+    """Infer power-connection causality in a serialized component tree.
+
+    This is currently a traversal stub: it ensures every power connection has a
+    causality value, while preserving causality already supplied by callers.
+    Future inference rules should assign ``source``, ``target``,
+    ``warn_source``, or ``warn_target`` here and return the same tree.
+
+    The input is mutated and returned so the composer receives the inferred
+    representation without needing a second document conversion.
+    """
+
+    if toplevel:
+        # Reset causalities
+        reset_causality(component)
+
+    implementation = component.get("implementation", {})
+    graph = implementation.get("graph") if isinstance(implementation, dict) else None
+    if not isinstance(graph, dict):
+        return component
+    
+    id_list = build_id_list(component)
+
+    # Fixed causalities
+    for block in graph.get("blocks", []):
+        for port in block.get('interface', {}).get('ports', []):
+            if port.get('type', '') != 'power':
+                continue
+            if port.get('causality', 'indifferent') == 'fixed effort out':
+                propagate_from_port(block, port, 'effort out', graph, id_list)
+            elif port.get('causality', 'indifferent') == 'fixed flow out':
+                propagate_from_port(block, port, 'flow out', graph, id_list)
+
+    # Preferred causalities
+    for block in graph.get("blocks", []):
+        for port in block.get('interface', {}).get('ports', []):
+            if port.get('type', '') != 'power':
+                continue
+            if is_port_fully_assigned(block, port, graph):
+                continue
+            if port.get('causality', 'indifferent') == 'preferred effort out':
+                propagate_from_port(block, port, 'effort out', graph, id_list)
+            elif port.get('causality', 'indifferent') == 'preferred flow out':
+                propagate_from_port(block, port, 'flow out', graph, id_list)
+
+            
+
+    # Soft choices may need several passes when a junction has multiple
+    # unresolved bonds. Stop as soon as a pass makes no further progress.
+    while True:
+        unresolved_before = sum(
+            con.get('type') == 'power' and con.get('causality', 'none') == 'none'
+            for con in graph.get('connections', [])
+        )
+        for block in graph.get("blocks", []):
+            for port in block.get('interface', {}).get('ports', []):
+                if port.get('type', '') != 'power':
+                    continue
+                if is_port_fully_assigned(block, port, graph):
+                    continue
+                if port.get('causality', 'indifferent') == 'likes effort out':
+                    propagate_from_port(block, port, 'effort out', graph, id_list)
+                elif port.get('causality', 'indifferent') == 'likes flow out':
+                    propagate_from_port(block, port, 'flow out', graph, id_list)
+                elif port.get('causality', 'indifferent') == 'single effort in':
+                    evaluate_junction_constraints(block, port, graph, id_list)
+                    if not is_port_fully_assigned(block, port, graph):
+                        propagate_from_port(block, port, 'flow out', graph, id_list)
+                elif port.get('causality', 'indifferent') == 'single flow in':
+                    evaluate_junction_constraints(block, port, graph, id_list)
+                    if not is_port_fully_assigned(block, port, graph):
+                        propagate_from_port(block, port, 'effort out', graph, id_list)
+                elif port.get('causality', 'indifferent') == 'indifferent':
+                    # Force an arbitrary assignment on the first unassigned bond connected to this port
+                    propagate_from_port(block, port, 'effort out', graph, id_list)
+        unresolved_after = sum(
+            con.get('type') == 'power' and con.get('causality', 'none') == 'none'
+            for con in graph.get('connections', [])
+        )
+        if unresolved_after == 0 or unresolved_after >= unresolved_before:
+            break
+
+    # Last check
+    for con in graph.get('connections', []):
+        if con.get('type') == 'power' and con.get('causality', 'none') == 'none':
+            raise ValueError("System under-constrained: unresolved causal loops or disconnected elements remain")
+
+    for block in graph.get("blocks", []):
+        if isinstance(block, dict):
+            infer_causality(block, False)
+
+    return component
+
+def reset_causality(component: dict[str, Any]) -> None:
+    implementation = component.get("implementation", {})
+    graph = implementation.get("graph") if isinstance(implementation, dict) else None
+    if not isinstance(graph, dict):
+        return
+    for connection in graph.get("connections", []):
+        if isinstance(connection, dict) and connection.get("type") == "power":
+            connection["causality"] = "none"
+    for block in graph.get("blocks", []):
+        if isinstance(block, dict):
+            reset_causality(block)
+
+def build_id_list(graph: dict[str, Any]) -> dict[str, Any]:
+    """Index all addressable objects in a component tree by their stable ID."""
+
+    id_list: dict[str, Any] = {}
+    id_kinds: dict[str, str] = {}
+
+    def add(item: dict[str, Any], description: str) -> None:
+        item_id = item.get("id")
+        if not item_id:
+            raise ValueError(f"{description} has no ID")
+        # Port IDs identify a port on a component definition and may therefore
+        # recur in cloned component instances. Component and junction IDs are
+        # document objects and must remain globally unique.
+        if item_id in id_list and not (
+            description == "port" and id_kinds[item_id] == "port"
+        ):
+            raise ValueError(f"Duplicate simulation object ID: {item_id}")
+        id_list[item_id] = item
+        id_kinds[item_id] = description
+
+    def visit(component: dict[str, Any]) -> None:
+        add(component, "component")
+        interface = component.get("interface", {})
+        for port in interface.get("ports", []):
+            add(port, "port")
+
+        implementation = component.get("implementation", {})
+        if implementation.get("kind") != "graph":
+            return
+        nested_graph = implementation.get("graph", {})
+        for junction in nested_graph.get("junctions", []):
+            add(junction, "junction")
+        for block in nested_graph.get("blocks", []):
+            visit(block)
+
+    visit(graph)
+    return id_list
+
+def is_port_fully_assigned(block: dict[str, Any], port: dict[str, Any], graph: dict[str, Any]) -> bool:
+    block_id = block.get('id')
+    port_id = port.get('id')
+    for connection in graph.get('connections', []):
+        if connection.get('type') != 'power':
+            continue
+        source = connection.get('source', {})
+        target = connection.get('target', {})
+        if ((source.get('block') == block_id and source.get('port') == port_id)
+                or (target.get('block') == block_id and target.get('port') == port_id)):
+            if connection.get('causality', 'none') == 'none':
+                return False
+    return True
+
+def propagate_from_port(block: dict[str, Any], port: dict[str, Any], desired_causality: str, graph: dict[str, Any], id_list: dict[str, Any]) -> None:
+    # find all connection on this specific port
+    attached_connections = []
+    for con in graph.get('connections', []):
+        if con.get('type') == 'power':
+            if con.get('source', {}).get('block') == block.get('id') and con.get('source', {}).get('port') == port.get('id'):
+                attached_connections.append(con)
+            elif con.get('target', {}).get('block') == block.get('id') and con.get('target', {}).get('port') == port.get('id'):
+                attached_connections.append(con)
+    if not attached_connections:
+        # unconnected port
+        return
+    
+    # find first unassigned connection on this port
+    target_connection = None
+    for con in attached_connections:
+        if con.get('causality', None) == 'none':
+            target_connection = con
+            break
+    if target_connection is None:
+        # Nothing left to resolve
+        return
+
+    # Update
+    if target_connection.get('source').get('block') == block.get('id'):
+        target_connection['causality'] = 'target' if (desired_causality == 'effort out') else 'source'
+    else:
+        target_connection['causality'] = 'source' if (desired_causality == 'effort out') else 'target'
+
+    propagate_to_neighbor_from_connection(block, target_connection, graph, id_list)
+
+def evaluate_junction_constraints(block: dict[str, Any], port: dict[str, Any], graph: dict[str, Any], id_list: dict[str, Any]) -> None:
+    # find all connection on this specific port
+    attached_connections = []
+    for con in graph.get('connections', []):
+        if con.get('type') == 'power':
+            if con.get('source', {}).get('block') == block.get('id') and con.get('source', {}).get('port') == port.get('id'):
+                attached_connections.append(con)
+            elif con.get('target', {}).get('block') == block.get('id') and con.get('target', {}).get('port') == port.get('id'):
+                attached_connections.append(con)
+    if not attached_connections:
+        # unconnected port
+        return
+    
+    efforts_in = 0
+    efforts_out = 0
+    unnassigned_conns = []
+    # Count current states relative to the junction port
+    for con in attached_connections:
+        if con.get('causality', 'none') == 'none':
+            unnassigned_conns.append(con)
+            continue
+
+        is_source = (con.get('source').get('block') == block.get('id'))
+        if (is_source and con.get('causality', 'none')=='source') or (not is_source and con.get('causality', 'none')=='target'):
+            efforts_in += 1
+        else:
+            efforts_out += 1
+
+    # Single effort in
+    if port.get('causality', 'indifferent') == 'single effort in':
+        # ERROR CHECK: Multiple sources/blocks trying to claim effort control on a 0-junction
+        if efforts_in>1:
+            raise ValueError(f"Critical causality conflict: Multiple blocks are dictating effort to 0 junction: {block.get('name')}")
+        
+        # 1 effort is coming in so all other ports must be effort out
+        if efforts_in == 1 and len(unnassigned_conns) > 0:
+            for con in unnassigned_conns:
+                desired = 'target' if (con.get('source').get('block')==block.get('id')) else 'source'
+                con['causality'] = desired
+                propagate_to_neighbor_from_connection(block, con, graph, id_list)
+
+        # No effort is coming in yet and one left so must be effort in
+        if efforts_in == 0 and len(unnassigned_conns) == 1:
+            con = unnassigned_conns[0]
+            desired = 'source' if (con.get('source').get('block')==block.get('id')) else 'target'
+            con['causality'] = desired
+            propagate_to_neighbor_from_connection(block, con, graph, id_list)
+
+    # Single flow in
+    elif port.get('causality', 'indifferent') == 'single flow in':
+        # ERROR CHECK: Multiple sources/blocks trying to claim flow control on a 1-junction
+        if efforts_out>1:
+            raise ValueError(f"Critical causality conflict: Multiple blocks are dictating flow to 1 junction: {block.get('name')}")
+        
+        # 1 flow is coming in so all other ports must be flow out
+        if efforts_out == 1 and len(unnassigned_conns) > 0:
+            for con in unnassigned_conns:
+                desired = 'source' if (con.get('source').get('block')==block.get('id')) else 'target'
+                con['causality'] = desired
+                propagate_to_neighbor_from_connection(block, con, graph, id_list)
+
+        # No flow is coming in yet and one left so must be flow in
+        if efforts_out == 0 and len(unnassigned_conns) == 1:
+            con = unnassigned_conns[0]
+            desired = 'target' if (con.get('source').get('block')==block.get('id')) else 'source'
+            con['causality'] = desired
+            propagate_to_neighbor_from_connection(block, con, graph, id_list)
+
+def propagate_to_neighbor_from_connection(block: dict[str, Any], connection: dict[str, Any], graph: dict[str, Any], id_list: dict[str, Any]) -> None:
+    # Get the neighbor block and port on the other side of the bond
+    neighbor_id = connection.get('target').get('block') if connection.get('source').get('block') == block.get('id') else connection.get('source').get('block') 
+    neighbor_port_id = connection.get('target').get('port') if connection.get('source').get('block') == block.get('id') else connection.get('source').get('port') 
+    neighbor_block = id_list.get(neighbor_id, None)
+    if neighbor_block is None:
+        raise ValueError(f"No other side of the bond found on connection {connection.get('id')}")
+    neighbor_ports = neighbor_block.get('interface').get('ports', [])
+    neighbor_port = None
+    for p in neighbor_ports:
+        if p.get('id') == neighbor_port_id:
+            neighbor_port = p
+            break
+    if neighbor_port is None:
+        raise ValueError(f"No other side of the bond found on connection {connection.get('id')}")
+    
+    # Trigger evaluation on the neighbor
+    if neighbor_port.get('causality', 'indifferent') in ['single effort in', 'single flow in']:
+        evaluate_junction_constraints(neighbor_block, neighbor_port, graph, id_list)
+    else:
+        verify_component_compatibility(neighbor_block, neighbor_port, graph)
+
+def verify_component_compatibility(block: dict[str, Any], port: dict[str, Any], graph: dict[str, Any]) -> None:
+    # Find the connection we are evaluating
+    conn = None
+    for c in graph.get('connections', []):
+        if (c.get('source').get('block') == block.get('id') and c.get('source').get('port') == port.get('id')) or (c.get('target').get('block') == block.get('id') and c.get('target').get('port') == port.get('id')):
+            if c.get('causality', 'none') != 'none':
+                conn = c
+                break
+
+    if conn is None:
+        return
+
+    # Figure out what causality was pushed onto this port from the outside world
+    state = conn.get('causality', 'none')
+    is_source = conn.get('source', {}).get('block') == block.get('id')
+    effort_out = (is_source and state == 'target') or (not is_source and state == 'source')
+    port_causality = port.get('causality', 'indifferent')
+
+    if port_causality == 'fixed effort out' and not effort_out:
+        raise ValueError(f"Critical source conflict: Fixed effort source '{block.get('name')}' forced into an input state.")
+    if port_causality == 'fixed flow out' and effort_out:
+        raise ValueError(f"Critical source conflict: Fixed flow source '{block.get('name')}' forced into an input state.")
+
+    if port_causality == 'preferred effort out' and not effort_out:
+        conn['causality'] = f'warn_{state}'
+        # log.warning(f"Storage block '{block.get('name')}' was forced into derivative causality (dependent state).")
+    if port_causality == 'preferred flow out' and effort_out:
+        conn['causality'] = f'warn_{state}'
+        # log.warning(f"Storage block '{block.get('name')}' was forced into derivative causality (dependent state).")
--- a/BEdit/src/bedit/core/model.py
+++ b/BEdit/src/bedit/core/model.py
@@ -6,6 +6,24 @@ from typing import Any
 from uuid import uuid4

 from bedit.core.port_types import PortTypeRegistry
+from bedit.core.power_domains import (
+    MULTI_CONNECTION_POWER_CAUSALITIES,
+    POWER_CAUSALITIES,
+    POWER_DOMAINS,
+)
+
+
+def _dimensions(data: Any, subject: str) -> tuple[int, int]:
+    if not isinstance(data, dict):
+        raise ValueError(f"{subject} dimensions must be an object")
+    try:
+        rows = int(data.get("rows", 1))
+        columns = int(data.get("columns", 1))
+    except (TypeError, ValueError) as error:
+        raise ValueError(f"{subject} dimensions must be whole numbers") from error
+    if rows < 1 or columns < 1:
+        raise ValueError(f"{subject} dimensions must be at least 1")
+    return rows, columns


@dataclass
@@ -17,6 +35,15 @@ class Port:
    properties: dict[str, Any] = field(default_factory=dict)
    type: str = "signal"
    allows_multiple_connections: bool = False
+    value_type: str = "real"
+    quantity: str = ""
+    unit: str = ""
+    rows: int = 1
+    columns: int = 1
+    description: str = ""
+    orientation: str = "input"
+    domain: str = "power"
+    causality: str = "indifferent"

    def to_dict(self) -> dict[str, Any]:
        return {
@@ -26,11 +53,20 @@ class Port:
            "properties": self.properties,
            "type": self.type,
            "multipleConnections": self.allows_multiple_connections,
+            "valueType": self.value_type,
+            "quantity": self.quantity,
+            "unit": self.unit,
+            "dimensions": {"rows": self.rows, "columns": self.columns},
+            "description": self.description,
+            "orientation": self.orientation,
+            "domain": self.domain,
+            "causality": self.causality,
        }

    @classmethod
-    def from_dict(cls, data: dict[str, Any]) -> "Port":
+    def from_dict(cls, data: dict[str, Any], default_orientation: str = "input") -> "Port":
        position = data.get("position", {})
+        rows, columns = _dimensions(data.get("dimensions", {}), "Port")
        return cls(
            id=str(data["id"]),
            name=str(data.get("name", data["id"])),
@@ -39,6 +75,15 @@ class Port:
            properties=dict(data.get("properties", {})),
            type=str(data.get("type", "signal")),
            allows_multiple_connections=bool(data.get("multipleConnections", False)),
+            value_type=str(data.get("valueType", "real")),
+            quantity=str(data.get("quantity", "")),
+            unit=str(data.get("unit", "")),
+            rows=rows,
+            columns=columns,
+            description=str(data.get("description", "")),
+            orientation=str(data.get("orientation", default_orientation)),
+            domain=str(data.get("domain", "power")),
+            causality=str(data.get("causality", "indifferent")),
        )


@@ -139,6 +184,8 @@ class Connection:
    target: Endpoint
    name: str = ""
    properties: dict[str, Any] = field(default_factory=dict)
+    type: str = "signal"
+    causality: str = "none"

    def to_dict(self) -> dict[str, Any]:
        return {
@@ -147,6 +194,8 @@ class Connection:
            "target": self.target.to_dict(),
            "name": self.name,
            "properties": self.properties,
+            "type": self.type,
+            "causality": self.causality,
        }

    @classmethod
@@ -157,6 +206,8 @@ class Connection:
            target=Endpoint.from_dict(data["target"]),
            name=str(data.get("name", "")),
            properties=dict(data.get("properties", {})),
+            type=str(data.get("type", "signal")),
+            causality=str(data.get("causality", "none")),
        )


@@ -166,9 +217,23 @@ class Parameter:
    name: str
    type: str = "real"
    value: str = "0"
+    quantity: str = ""
+    unit: str = ""
+    rows: int = 1
+    columns: int = 1
+    description: str = ""

-    def to_dict(self) -> dict[str, str]:
-        return {"id": self.id, "name": self.name, "type": self.type, "value": self.value}
+    def to_dict(self) -> dict[str, Any]:
+        return {
+            "id": self.id,
+            "name": self.name,
+            "type": self.type,
+            "value": self.value,
+            "quantity": self.quantity,
+            "unit": self.unit,
+            "dimensions": {"rows": self.rows, "columns": self.columns},
+            "description": self.description,
+        }

    @classmethod
    def from_dict(cls, data: dict[str, Any]) -> "Parameter":
@@ -176,11 +241,17 @@ class Parameter:
            raise ValueError("Each component parameter must be an object")
        if "id" not in data:
            raise ValueError("Each component parameter must have an ID")
+        rows, columns = _dimensions(data.get("dimensions", {}), "Parameter")
        return cls(
            id=str(data["id"]),
            name=str(data.get("name", "")),
            type=str(data.get("type", "real")),
            value=str(data.get("value", "0")),
+            quantity=str(data.get("quantity", "")),
+            unit=str(data.get("unit", "")),
+            rows=rows,
+            columns=columns,
+            description=str(data.get("description", "")),
        )


@@ -299,8 +370,7 @@ class Component:
    x: float = 0.0
    y: float = 0.0
    rotation: float = 0.0
-    inputs: list[Port] = field(default_factory=list)
-    outputs: list[Port] = field(default_factory=list)
+    ports: list[Port] = field(default_factory=list)
    parameters: list[Parameter] = field(default_factory=list)
    icon: Icon = field(default_factory=Icon)
    properties: dict[str, Any] = field(default_factory=dict)
@@ -320,10 +390,7 @@ class Component:
            "name": self.name,
            "position": {"x": self.x, "y": self.y},
            "rotation": self.rotation,
-            "interface": {
-                "inputs": [port.to_dict() for port in self.inputs],
-                "outputs": [port.to_dict() for port in self.outputs],
-            },
+            "interface": {"ports": [port.to_dict() for port in self.ports]},
            "parameters": [parameter.to_dict() for parameter in self.parameters],
            "icon": self.icon.to_dict(),
            "properties": self.properties,
@@ -344,11 +411,19 @@ class Component:
        if kind == "text":
            raw_source = implementation.get("source", {})
            equations = raw_source.get("equations", "")
+            declarations = raw_source.get("declarations", "")
+            initial_equations = raw_source.get("initialEquations", "")
            parameters = data.get("parameters", raw_source.get("parameters", []))
            if not isinstance(equations, str):
                raise ValueError("Text component equations must be a string")
+            if not isinstance(declarations, str):
+                raise ValueError("Text component declarations must be a string")
+            if not isinstance(initial_equations, str):
+                raise ValueError("Text component initial equations must be a string")
            source = {
                "equations": equations,
+                "declarations": declarations,
+                "initialEquations": initial_equations,
            }
        if not isinstance(parameters, list):
            raise ValueError("Component parameters must be a list")
@@ -358,8 +433,7 @@ class Component:
            x=float(position.get("x", 0.0)),
            y=float(position.get("y", 0.0)),
            rotation=float(data.get("rotation", 0.0)),
-            inputs=[Port.from_dict(item) for item in interface.get("inputs", [])],
-            outputs=[Port.from_dict(item) for item in interface.get("outputs", [])],
+            ports=[Port.from_dict(item) for item in interface.get("ports", [])],
            parameters=[Parameter.from_dict(item) for item in parameters],
            icon=Icon.from_dict(data.get("icon")),
            properties=dict(data.get("properties", {})),
@@ -445,6 +519,13 @@ class GraphDocument:
                raise ValueError(f"Component {component.name!r} has duplicate parameter names")
            if any(not name.strip() for name in parameter_names):
                raise ValueError(f"Component {component.name!r} has an unnamed parameter")
+            if any(not parameter.type.strip() for parameter in component.parameters):
+                raise ValueError(f"Component {component.name!r} has an untyped parameter")
+            if any(
+                parameter.rows < 1 or parameter.columns < 1
+                for parameter in component.parameters
+            ):
+                raise ValueError(f"Component {component.name!r} has invalid parameter dimensions")
            if component.implementation_kind == "text" and component.graph.blocks:
                raise ValueError(f"Text component {component.name} cannot contain a graph")
            self._validate_graph(component)
@@ -456,16 +537,46 @@ class GraphDocument:
            raise ValueError(
                f"Component names inside {owner.name!r} must be unique"
            )
-        input_ids = {port.id for port in owner.inputs}
-        output_ids = {port.id for port in owner.outputs}
-        if len(input_ids) != len(owner.inputs) or len(output_ids) != len(owner.outputs):
+        port_ids = {port.id for port in owner.ports}
+        if len(port_ids) != len(owner.ports):
            raise ValueError(f"Component {owner.name} contains duplicate port IDs")
-        for port in (*owner.inputs, *owner.outputs):
+        for port in owner.ports:
            PortTypeRegistry.get(port.type)
+            if port.orientation not in {"input", "output", "indifferent"}:
+                raise ValueError(f"Port {port.name!r} has an invalid orientation")
+            if port.orientation == "indifferent" and port.type != "power":
+                raise ValueError("Only power ports may have indifferent orientation")
+            if port.type == "power":
+                if port.domain not in {domain.id for domain in POWER_DOMAINS}:
+                    raise ValueError(f"Power port {port.name!r} has an unknown domain")
+                if port.causality not in POWER_CAUSALITIES:
+                    raise ValueError(f"Power port {port.name!r} has invalid causality")
+                if (
+                    port.causality in MULTI_CONNECTION_POWER_CAUSALITIES
+                    and not port.allows_multiple_connections
+                ):
+                    raise ValueError(
+                        f"Power port {port.name!r} requires multiple connections "
+                        f"for causality {port.causality!r}"
+                    )
+            if not port.value_type.strip():
+                raise ValueError(f"Port {port.name!r} has no value type")
+            if port.rows < 1 or port.columns < 1:
+                raise ValueError(f"Port {port.name!r} has invalid dimensions")
        for junction in owner.graph.junctions.values():
            PortTypeRegistry.get(junction.type)
+            if junction.type == "power":
+                raise ValueError("Power bond connections cannot contain junctions")
        endpoint_counts: dict[tuple[str, str, str], int] = {}
        for connection in owner.graph.connections.values():
+            if connection.causality not in {
+                "none",
+                "source",
+                "target",
+                "warn_source",
+                "warn_target",
+            }:
+                raise ValueError(f"Connection {connection.id} has invalid causality")
            if connection.source.junction is not None:
                junction = owner.graph.junctions.get(connection.source.junction)
                if junction is None:
@@ -474,14 +585,30 @@ class GraphDocument:
                    )
                source_port = Port(junction.id, "Junction", type=junction.type)
            elif connection.source.interface is not None:
-                if connection.source.interface not in input_ids:
+                source_ports = [
+                    port
+                    for port in owner.ports
+                    if port.orientation in {"input", "indifferent"}
+                ]
+                if connection.source.interface not in {port.id for port in source_ports}:
                    raise ValueError(f"Connection {connection.id} uses an unknown interface input")
-                source_port = next(p for p in owner.inputs if p.id == connection.source.interface)
+                source_port = next(
+                    port for port in source_ports if port.id == connection.source.interface
+                )
            else:
                source = owner.graph.blocks.get(connection.source.block or "")
-                if source is None or connection.source.port not in {p.id for p in source.outputs}:
+                source_ports = (
+                    []
+                    if source is None
+                    else [
+                        port
+                        for port in source.ports
+                        if port.orientation in {"output", "indifferent"}
+                    ]
+                )
+                if source is None or connection.source.port not in {p.id for p in source_ports}:
                    raise ValueError(f"Connection {connection.id} uses an unknown block output")
-                source_port = next(p for p in source.outputs if p.id == connection.source.port)
+                source_port = next(p for p in source_ports if p.id == connection.source.port)
            if connection.target.junction is not None:
                junction = owner.graph.junctions.get(connection.target.junction)
                if junction is None:
@@ -495,16 +622,44 @@ class GraphDocument:
                    allows_multiple_connections=False,
                )
            elif connection.target.interface is not None:
-                if connection.target.interface not in output_ids:
+                target_ports = [
+                    port
+                    for port in owner.ports
+                    if port.orientation in {"output", "indifferent"}
+                ]
+                if connection.target.interface not in {port.id for port in target_ports}:
                    raise ValueError(f"Connection {connection.id} uses an unknown interface output")
-                target_port = next(p for p in owner.outputs if p.id == connection.target.interface)
+                target_port = next(
+                    port for port in target_ports if port.id == connection.target.interface
+                )
            else:
                target = owner.graph.blocks.get(connection.target.block or "")
-                if target is None or connection.target.port not in {p.id for p in target.inputs}:
+                target_ports = (
+                    []
+                    if target is None
+                    else [
+                        port
+                        for port in target.ports
+                        if port.orientation in {"input", "indifferent"}
+                    ]
+                )
+                if target is None or connection.target.port not in {
+                    port.id for port in target_ports
+                }:
                    raise ValueError(f"Connection {connection.id} uses an unknown block input")
-                target_port = next(p for p in target.inputs if p.id == connection.target.port)
-            if not PortTypeRegistry.compatible(source_port.type, target_port.type):
+                target_port = next(
+                    port for port in target_ports if port.id == connection.target.port
+                )
+            if not PortTypeRegistry.compatible(
+                source_port.type,
+                target_port.type,
+                source_port.domain,
+                target_port.domain,
+            ):
                raise ValueError(f"Connection {connection.id} joins incompatible port types")
+            # The endpoint ports remain authoritative. This also upgrades older
+            # documents whose connections predate the explicit type field.
+            connection.type = source_port.type
            source_key = (
                "source-junction"
                if connection.source.junction is not None
@@ -567,6 +722,8 @@ def clone_component(source: Component) -> Component:
                    remap(connection.target),
                    connection.name,
                    deepcopy(connection.properties),
+                    connection.type,
+                    connection.causality,
                )
                for connection in current.graph.connections.values()
                for new_id in [str(uuid4())]
@@ -599,30 +756,7 @@ def clone_component(source: Component) -> Component:
            name=current.name,
            x=current.x,
            y=current.y,
-            inputs=[
-                Port(
-                    port.id,
-                    port.name,
-                    port.x,
-                    port.y,
-                    deepcopy(port.properties),
-                    port.type,
-                    port.allows_multiple_connections,
-                )
-                for port in current.inputs
-            ],
-            outputs=[
-                Port(
-                    port.id,
-                    port.name,
-                    port.x,
-                    port.y,
-                    deepcopy(port.properties),
-                    port.type,
-                    port.allows_multiple_connections,
-                )
-                for port in current.outputs
-            ],
+            ports=[Port.from_dict(port.to_dict()) for port in current.ports],
            parameters=deepcopy(current.parameters),
            icon=Icon.from_dict(current.icon.to_dict()),
            properties=deepcopy(current.properties),
--- a/BEdit/src/bedit/core/physical_types.py
+++ b/BEdit/src/bedit/core/physical_types.py
@@ -0,0 +1,47 @@
+"""Editable suggestions for signal and parameter physical metadata.
+
+These values populate editable combo boxes; documents may use values not listed
+here. They are suggestions rather than a validation registry.
+"""
+
+VALUE_TYPES = ("real", "integer", "boolean", "string")
+
+QUANTITIES = (
+    "",
+    "Angle",
+    "AngularVelocity",
+    "Current",
+    "Energy",
+    "Force",
+    "Frequency",
+    "Length",
+    "Mass",
+    "Power",
+    "Pressure",
+    "Temperature",
+    "Time",
+    "Torque",
+    "Velocity",
+    "Voltage",
+)
+
+UNITS = (
+    "",
+    "1",
+    "A",
+    "Hz",
+    "J",
+    "K",
+    "N",
+    "N.m",
+    "Pa",
+    "V",
+    "W",
+    "deg",
+    "kg",
+    "m",
+    "m/s",
+    "rad",
+    "rad/s",
+    "s",
+)
--- a/BEdit/src/bedit/core/port_types.py
+++ b/BEdit/src/bedit/core/port_types.py
@@ -14,6 +14,7 @@ class PortType:
 class PortTypeRegistry:
    _types = {
        "signal": PortType("signal", "Signal", "A scalar signal connection"),
+        "power": PortType("power", "Power", "A two-variable power connection"),
    }

    @classmethod
@@ -28,5 +29,13 @@ class PortTypeRegistry:
            raise ValueError(f"Unknown port type: {type_id}") from error

    @classmethod
-    def compatible(cls, first: str, second: str) -> bool:
-        return cls.get(first).accepts(cls.get(second))
+    def compatible(
+        cls,
+        first: str,
+        second: str,
+        first_domain: str = "",
+        second_domain: str = "",
+    ) -> bool:
+        if not cls.get(first).accepts(cls.get(second)):
+            return False
+        return first != "power" or first_domain == second_domain
--- a/BEdit/src/bedit/core/power_domains.py
+++ b/BEdit/src/bedit/core/power_domains.py
@@ -0,0 +1,49 @@
+"""Editable power-port domain definitions used by the port editor."""
+
+from dataclasses import dataclass
+
+
+@dataclass(frozen=True)
+class PowerDomain:
+    id: str
+    display_name: str
+    effort: str
+    flow: str
+
+
+POWER_DOMAINS: tuple[PowerDomain, ...] = (
+    PowerDomain("power", "Power", "p.e", "p.f"),
+)
+
+
+def power_domain(domain_id: str) -> PowerDomain:
+    return next((domain for domain in POWER_DOMAINS if domain.id == domain_id), POWER_DOMAINS[0])
+
+
+STANDARD_POWER_CAUSALITIES = (
+    "fixed flow out",
+    "fixed effort out",
+    "preferred flow out",
+    "preferred effort out",
+    "likes flow out",
+    "likes effort out",
+    "indifferent",
+)
+
+MULTI_CONNECTION_POWER_CAUSALITIES = (
+    "single effort in",
+    "single flow in",
+)
+
+POWER_CAUSALITIES = (
+    *STANDARD_POWER_CAUSALITIES,
+    *MULTI_CONNECTION_POWER_CAUSALITIES,
+)
+
+
+def power_causalities(allows_multiple_connections: bool = False) -> tuple[str, ...]:
+    """Return the causalities available for one power port configuration."""
+
+    if allows_multiple_connections:
+        return POWER_CAUSALITIES
+    return STANDARD_POWER_CAUSALITIES
--- a/BEdit/src/bedit/core/simulation/init.py
+++ b/BEdit/src/bedit/core/simulation/init.py
@@ -1,9 +1,10 @@
 from bedit.core.simulation.service import Simulation
-from bedit.core.simulation.openmodelica import OpenModelicaInterface
+from bedit.core.simulation.openmodelica import ModelBuildResult, OpenModelicaInterface
 from bedit.core.simulation.results import (
    BerSimulationResultsSerializer,
    JsonSimulationResultsSerializer,
    SimulationExecutionResult,
+    SimulationGraph,
    SimulationResults,
    SimulationResultsSerializer,
    SimulationTrace,
@@ -11,9 +12,11 @@ from bedit.core.simulation.results import (

 __all__ = [
    "OpenModelicaInterface",
+    "ModelBuildResult",
    "Simulation",
    "SimulationResults",
    "SimulationExecutionResult",
+    "SimulationGraph",
    "SimulationResultsSerializer",
    "SimulationTrace",
    "BerSimulationResultsSerializer",
--- a/BEdit/src/bedit/core/simulation/composer.py
+++ b/BEdit/src/bedit/core/simulation/composer.py
@@ -59,9 +59,7 @@ def build_id_list(graph: dict[str, Any]) -> dict[str, Any]:
    def visit(component: dict[str, Any]) -> None:
        add(component, "component")
        interface = component.get("interface", {})
-        for port in interface.get("inputs", []):
-            add(port, "port")
-        for port in interface.get("outputs", []):
+        for port in interface.get("ports", []):
            add(port, "port")

        implementation = component.get("implementation", {})
@@ -82,6 +80,7 @@ def emit_model(
    id_list: dict[str, Any],
    indent: int = 0,
    connection_counts: dict[str, int] | None = None,
+    connection_signs: dict[str, list[float]] | None = None,
 ) -> str:
    """Emit a component and its nested definitions as Modelica source."""

@@ -94,33 +93,58 @@ def emit_model(
    implementation_kind = implementation.get("kind")
    nested_graph = implementation.get("graph", {})
    port_counts = connection_counts or _interface_connection_counts(graph)
-    macros = _port_count_macros(graph, port_counts)
+    port_signs = connection_signs or _interface_connection_signs(graph)
+    macros = _port_connection_macros(graph, port_counts, port_signs)
+
+    if indent == 0 and _contains_power_port(graph):
+        lines.extend(
+            (
+                f"{body_indent}connector BondPort \"Bond graph power port\"",
+                f"{body_indent}\tReal e \"Effort variable\";",
+                f"{body_indent}\tflow Real f \"Flow variable\";",
+                f"{body_indent}end BondPort;",
+            )
+        )

    if implementation_kind == "graph":
        for block in nested_graph.get("blocks", []):
+            block_counts, block_signs = _block_connection_data(
+                nested_graph, block["id"]
+            )
            lines.extend(
                emit_model(
                    block,
                    {},
                    indent + 1,
-                    _block_connection_counts(nested_graph, block["id"]),
+                    block_counts,
+                    block_signs,
                )
                .rstrip()
                .splitlines()
            )

    interface = graph.get("interface", {})
-    for port in interface.get("inputs", []):
-        lines.append(_port_declaration(port, "input", indent + 1, macros))
-    for port in interface.get("outputs", []):
-        lines.append(_port_declaration(port, "output", indent + 1, macros))
+    for port in interface.get("ports", []):
+        direction = "output" if port.get("orientation") == "output" else "input"
+        lines.append(_port_declaration(port, direction, indent + 1, macros))

    for parameter in graph.get("parameters", []):
        parameter_type = modelica_type(parameter.get("type", "real"))
        parameter_name = identifier(parameter["name"])
        value = expand_bevalues(str(parameter.get("value", "0")), macros)
+        dimensions = _fixed_dimensions(parameter)
+        attributes = _quantity_unit_attributes(parameter)
        lines.append(
-            f"{body_indent}parameter {parameter_type} {parameter_name} = {value};"
+            f"{body_indent}parameter {parameter_type} {parameter_name}"
+            f"{dimensions}{attributes} = {value};"
+        )
+
+    if implementation_kind == "text":
+        declarations = str(implementation.get("source", {}).get("declarations", ""))
+        declarations = expand_bevalues(declarations, macros)
+        lines.extend(
+            f"{body_indent}{line}" if line.strip() else ""
+            for line in declarations.splitlines()
        )

    if implementation_kind == "graph":
@@ -134,8 +158,9 @@ def emit_model(
                f"{body_indent}{junction_type} {_junction_name(junction['id'])};"
            )

-    lines.append(f"{indentation}equation")
    if implementation_kind == "graph":
+        lines.append(f"{indentation}equation")
+
        blocks = {block["id"]: block for block in nested_graph.get("blocks", [])}
        junctions = {
            junction["id"]: junction for junction in nested_graph.get("junctions", [])
@@ -148,11 +173,26 @@ def emit_model(
            target = _endpoint_expression(
                connection["target"], graph, blocks, junctions, endpoint_indices
            )
-            # Connector types may require different equations in future.
-            lines.append(f"{body_indent}{target} = {source};")
+            if connection.get("type") == "power":
+                lines.append(f"{body_indent}connect({source}, {target});")
+            else:
+                lines.append(f"{body_indent}{target} = {source};")
    else:
+        initial_equations = str(
+            implementation.get("source", {}).get("initialEquations", "")
+        )
+        initial_equations = expand_bevalues(initial_equations, macros)
        equations = str(implementation.get("source", {}).get("equations", ""))
        equations = expand_bevalues(equations, macros)
+
+        if initial_equations.strip():
+            lines.append(f"{indentation}initial equation")
+            lines.extend(
+                f"{body_indent}{line}" if line.strip() else ""
+                for line in initial_equations.splitlines()
+            )
+
+        lines.append(f"{indentation}equation")
        lines.extend(
            f"{body_indent}{line}" if line.strip() else ""
            for line in equations.splitlines()
@@ -161,7 +201,6 @@ def emit_model(
    lines.append(f"{indentation}end {model_name};")
    return "\n".join(lines) + "\n"

-
 def cleanup_graph(graph: dict[str, Any]) -> dict[str, Any]:
    """Remove annotations and UI-only data from a serialized component tree."""

@@ -192,14 +231,52 @@ def cleanup_graph(graph: dict[str, Any]) -> dict[str, Any]:
 def _port_declaration(
    port: dict[str, Any], direction: str, indent: int, macros: dict[str, str]
 ) -> str:
-    port_type = modelica_type(port.get("type", "signal"))
    indentation = "\t" * indent
    port_name = identifier(port["name"])
-    dimension = f"[${port_name}_N$]" if port.get("multipleConnections", False) else ""
-    declaration = f"{indentation}{direction} {port_type} {port_name}{dimension};"
+    dimensions = _port_dimensions(port, port_name)
+    if port.get("type") == "power":
+        return expand_bevalues(
+            f"{indentation}BondPort {port_name}{dimensions};", macros
+        )
+    port_type = modelica_type(port.get("valueType", "real"))
+    attributes = _quantity_unit_attributes(port)
+    declaration = (
+        f"{indentation}{direction} {port_type} {port_name}{dimensions}{attributes};"
+    )
    return expand_bevalues(declaration, macros)


+def _fixed_dimensions(item: dict[str, Any]) -> str:
+    dimensions = item.get("dimensions", {})
+    rows = max(1, int(dimensions.get("rows", 1)))
+    columns = max(1, int(dimensions.get("columns", 1)))
+    if rows == columns == 1:
+        return ""
+    if columns == 1:
+        return f"[{rows}]"
+    return f"[{rows},{columns}]"
+
+
+def _port_dimensions(port: dict[str, Any], port_name: str) -> str:
+    fixed = _fixed_dimensions(port)
+    if not port.get("multipleConnections", False):
+        return fixed
+    entries = [f"${port_name}_N$"]
+    if fixed:
+        entries.extend(fixed[1:-1].split(","))
+    return f"[{','.join(entries)}]"
+
+
+def _quantity_unit_attributes(item: dict[str, Any]) -> str:
+    attributes = []
+    for key in ("quantity", "unit"):
+        value = str(item.get(key, "")).strip()
+        if value:
+            escaped = value.replace("\\", "\\\\").replace('"', '\\"')
+            attributes.append(f'{key}="{escaped}"')
+    return f"({', '.join(attributes)})" if attributes else ""
+
+
 def _endpoint_expression(
    endpoint: dict[str, Any],
    owner: dict[str, Any],
@@ -244,16 +321,21 @@ def _index_array_endpoint(
    return f"{expression}[{endpoint_indices[key]}]"


-def _block_connection_counts(
+def _block_connection_data(
    graph: dict[str, Any], block_id: str
-) -> dict[str, int]:
+) -> tuple[dict[str, int], dict[str, list[float]]]:
    counts: dict[str, int] = {}
+    signs: dict[str, list[float]] = {}
    for connection in graph.get("connections", []):
-        for endpoint in (connection.get("source", {}), connection.get("target", {})):
+        for endpoint, sign in (
+            (connection.get("source", {}), -1.0),
+            (connection.get("target", {}), 1.0),
+        ):
            if endpoint.get("block") == block_id and endpoint.get("port"):
                port_id = endpoint["port"]
                counts[port_id] = counts.get(port_id, 0) + 1
-    return counts
+                signs.setdefault(port_id, []).append(sign)
+    return counts, signs


 def _interface_connection_counts(component: dict[str, Any]) -> dict[str, int]:
@@ -269,19 +351,56 @@ def _interface_connection_counts(component: dict[str, Any]) -> dict[str, int]:
    return counts


-def _port_count_macros(
-    component: dict[str, Any], connection_counts: dict[str, int]
+def _interface_connection_signs(component: dict[str, Any]) -> dict[str, list[float]]:
+    implementation = component.get("implementation", {})
+    if implementation.get("kind") != "graph":
+        return {}
+    signs: dict[str, list[float]] = {}
+    for connection in implementation.get("graph", {}).get("connections", []):
+        for endpoint, sign in (
+            (connection.get("source", {}), -1.0),
+            (connection.get("target", {}), 1.0),
+        ):
+            port_id = endpoint.get("interface")
+            if port_id:
+                signs.setdefault(port_id, []).append(sign)
+    return signs
+
+
+def _port_connection_macros(
+    component: dict[str, Any],
+    connection_counts: dict[str, int],
+    connection_signs: dict[str, list[float]],
 ) -> dict[str, str]:
    macros: dict[str, str] = {}
    interface = component.get("interface", {})
-    for port in (*interface.get("inputs", []), *interface.get("outputs", [])):
+    for port in interface.get("ports", []):
        if port.get("multipleConnections", False):
-            macros[f"{identifier(port['name'])}_N"] = str(
-                connection_counts.get(port["id"], 0)
-            )
+            macro_name = identifier(port["name"])
+            port_id = port["id"]
+            macros[f"{macro_name}_N"] = str(connection_counts.get(port_id, 0))
+            signs = connection_signs.get(port_id, [])
+            macros[f"{macro_name}_S"] = "{" + ", ".join(
+                f"{sign:.1f}" for sign in signs
+            ) + "}"
    return macros


+def _contains_power_port(component: dict[str, Any]) -> bool:
+    if any(
+        port.get("type") == "power"
+        for port in component.get("interface", {}).get("ports", [])
+    ):
+        return True
+    implementation = component.get("implementation", {})
+    if implementation.get("kind") != "graph":
+        return False
+    return any(
+        _contains_power_port(block)
+        for block in implementation.get("graph", {}).get("blocks", [])
+    )
+
+
 def expand_bevalues(text: str, values: dict[str, str]) -> str:
    """Replace BEdit ``$name$`` macros and reject unresolved composer values."""

@@ -296,8 +415,7 @@ def expand_bevalues(text: str, values: dict[str, str]) -> str:

 def _find_port(component: dict[str, Any], port_id: str) -> dict[str, Any]:
    interface = component.get("interface", {})
-    ports = [*interface.get("inputs", []), *interface.get("outputs", [])]
-    for port in ports:
+    for port in interface.get("ports", []):
        if port.get("id") == port_id:
            return port
    raise ValueError(
--- a/BEdit/src/bedit/core/simulation/openmodelica.py
+++ b/BEdit/src/bedit/core/simulation/openmodelica.py
@@ -1,5 +1,7 @@
 import json
+import logging
 import os
+import re
 import shlex
 import shutil
 import socket
@@ -48,6 +50,15 @@ class SimulationMessage:
    text: str


+@dataclass(frozen=True)
+class ModelBuildResult:
+    """OMC's model check summary and subsequent build response."""
+
+    check_summary: str
+    build_result: Any
+    diagnostics: str = ""
+
+
 class OpenModelicaInterface:
    """Asynchronous, persistent interface to one OpenModelica session.

@@ -92,10 +103,42 @@ class OpenModelicaInterface:
        """Load and build one composed model as an ordered worker operation."""

        def operation(omc, _temp_dir: Path):
-            loaded = omc.sendExpression(f"loadString({json.dumps(model)})")
-            if loaded is not True:
-                raise RuntimeError("OpenModelica could not load the composed model")
-            return omc.sendExpression(f"buildModel({model_name})")
+            capture = _LogCapture()
+            ompython_logger = logging.getLogger("OMPython")
+            previous_propagate = ompython_logger.propagate
+            ompython_logger.addHandler(capture)
+            ompython_logger.propagate = False
+            try:
+                unit_checking = omc.sendExpression(
+                    'setCommandLineOptions("--unitChecking")'
+                )
+                if unit_checking is not True:
+                    raise RuntimeError("OpenModelica could not enable unit checking")
+                loaded = omc.sendExpression(f"loadString({json.dumps(model)})")
+                if loaded is not True:
+                    raise RuntimeError("OpenModelica could not load the composed model")
+                diagnostics = [_read_omc_diagnostics(omc)]
+                check_summary = omc.sendExpression(f"checkModel({model_name})")
+                diagnostics.append(_read_omc_diagnostics(omc))
+                if not isinstance(check_summary, str) or not check_summary.strip():
+                    raise RuntimeError(
+                        "OpenModelica did not return a model-check summary"
+                    )
+                raw_build_result = omc.sendExpression(
+                    f"buildModel({model_name})", parsed=False
+                )
+                build_result = _parse_modelica_string_array(raw_build_result)
+                diagnostics.append(_read_omc_diagnostics(omc))
+                diagnostics.extend(capture.messages)
+                diagnostic_text = "\n".join(
+                    item.strip()
+                    for item in diagnostics
+                    if isinstance(item, str) and item.strip()
+                )
+                return ModelBuildResult(check_summary, build_result, diagnostic_text)
+            finally:
+                ompython_logger.removeHandler(capture)
+                ompython_logger.propagate = previous_propagate

        self._submit("build model", operation, callback, error_callback)

@@ -247,6 +290,51 @@ class OpenModelicaInterface:
            shutil.rmtree(temp_dir, ignore_errors=True)


+def _read_omc_diagnostics(omc) -> str:
+    """Read OMC diagnostics without sending multiline text through OMPython's parser."""
+
+    raw = omc.sendExpression("getErrorString()", parsed=False)
+    if isinstance(raw, bytes):
+        raw = raw.decode("utf-8", errors="replace")
+    if not isinstance(raw, str):
+        return ""
+    text = raw.strip()
+    if not text:
+        return ""
+    try:
+        decoded = json.loads(text)
+    except json.JSONDecodeError:
+        return text
+    return decoded if isinstance(decoded, str) else text
+
+
+class _LogCapture(logging.Handler):
+    """Collect dependency log messages for forwarding through BEdit's logger."""
+
+    def __init__(self) -> None:
+        super().__init__(level=logging.WARNING)
+        self.messages: list[str] = []
+
+    def emit(self, record: logging.LogRecord) -> None:
+        self.messages.append(record.getMessage())
+
+
+def _parse_modelica_string_array(raw: Any) -> tuple[str, ...]:
+    """Parse the string array returned by ``buildModel`` in raw mode."""
+
+    if isinstance(raw, bytes):
+        raw = raw.decode("utf-8", errors="replace")
+    if not isinstance(raw, str):
+        raise RuntimeError(f"OpenModelica returned an invalid build result: {raw!r}")
+    values = tuple(
+        json.loads(token)
+        for token in re.findall(r'"(?:\\.|[^"\\])*"', raw)
+    )
+    if not values:
+        raise RuntimeError(f"OpenModelica returned an invalid build result: {raw!r}")
+    return values
+
+
 def _deliver_callback(callback: Callable[[Any], None], value: Any) -> None:
    try:
        callback(value)
@@ -334,16 +422,140 @@ def _run_model_with_tcp(
                f"OpenModelica did not create the expected result file {result_path.name!r}"
            )
        data = load_openmodelica_csv(result_path)
+        init_path = temp_dir / f"{Path(executable).stem}_init.xml"
+        csv_column_count = len(data)
+        data = _add_openmodelica_alias_signals(init_path, data)
+        signal_metadata = _load_openmodelica_signal_metadata(init_path, data)
        log.info(
-            "Loaded %d result columns from %s", len(data), result_path.name
+            "Loaded %d result columns, restored %d OMC aliases, and found %d "
+            "unit definitions from %s",
+            csv_column_count,
+            len(data) - csv_column_count,
+            len(signal_metadata),
+            result_path.name,
        )
        return SimulationExecutionResult(
            return_code=int(return_code),
            result_file=str(result_path),
            data=data,
+            signal_metadata=signal_metadata,
        )


+def _add_openmodelica_alias_signals(
+    path: Path, data: dict[str, list[float]]
+) -> dict[str, list[float]]:
+    """Restore result aliases exactly as described by OMC's init XML."""
+
+    try:
+        root = ET.parse(path).getroot()
+    except (OSError, ET.ParseError) as error:
+        raise RuntimeError(
+            f"Could not read OpenModelica aliases from {path.name}: {error}"
+        ) from error
+
+    variables: dict[str, dict[str, str]] = {}
+    for scalar in root.findall(".//ScalarVariable"):
+        name = scalar.get("name", "")
+        if not name:
+            continue
+        value = next(iter(scalar), None)
+        variables[name] = {
+            "alias": scalar.get("alias", "noAlias"),
+            "target": scalar.get("aliasVariable", ""),
+            "variability": scalar.get("variability", ""),
+            "start": value.get("start", "") if value is not None else "",
+        }
+
+    restored = {name: list(values) for name, values in data.items()}
+    sample_count = len(next(iter(data.values()), []))
+
+    def resolve(name: str, visited: set[str] | None = None) -> list[float] | None:
+        if name in restored:
+            return restored[name]
+        variable = variables.get(name)
+        if variable is None:
+            return None
+        visited = set() if visited is None else visited
+        if name in visited:
+            return None
+        visited.add(name)
+        alias_kind = variable["alias"]
+        target = variable["target"]
+        if alias_kind in {"alias", "negatedAlias"} and target:
+            values = resolve(target, visited)
+            if values is None:
+                return None
+            return [-value for value in values] if alias_kind == "negatedAlias" else list(values)
+        if variable["variability"] not in {"parameter", "constant"}:
+            return None
+        try:
+            value = float(variable["start"])
+        except ValueError:
+            return None
+        return [value] * sample_count
+
+    for name, variable in variables.items():
+        if variable["alias"] not in {"alias", "negatedAlias"} or name in restored:
+            continue
+        values = resolve(name)
+        if values is not None:
+            restored[name] = values
+    return restored
+
+
+def _load_openmodelica_signal_metadata(
+    path: Path, signal_names: dict[str, list[float]]
+) -> dict[str, dict[str, str]]:
+    """Read units reported by OMC in its generated initialization XML."""
+
+    try:
+        root = ET.parse(path).getroot()
+    except (OSError, ET.ParseError) as error:
+        raise RuntimeError(
+            f"Could not read OpenModelica unit metadata from {path.name}: {error}"
+        ) from error
+
+    variables: dict[str, tuple[dict[str, str], str]] = {}
+    for scalar in root.findall(".//ScalarVariable"):
+        name = scalar.get("name", "")
+        if not name:
+            continue
+        value = next(iter(scalar), None)
+        metadata: dict[str, str] = {}
+        if value is not None:
+            for key in ("unit", "displayUnit", "quantity"):
+                attribute = value.get(key, "")
+                if attribute:
+                    metadata[key] = attribute
+        description = scalar.get("description", "")
+        if description:
+            metadata["description"] = description
+        variables[name] = (metadata, scalar.get("aliasVariable", ""))
+
+    def resolve(name: str, visited: set[str] | None = None) -> dict[str, str]:
+        metadata, alias = variables.get(name, ({}, ""))
+        if metadata.get("unit") or not alias:
+            return dict(metadata)
+        visited = set() if visited is None else visited
+        if name in visited:
+            return dict(metadata)
+        visited.add(name)
+        inherited = resolve(alias, visited)
+        return {**inherited, **metadata}
+
+    metadata: dict[str, dict[str, str]] = {}
+    for name in signal_names:
+        if name not in variables:
+            continue
+        resolved = resolve(name)
+        if resolved:
+            metadata[name] = resolved
+    if "time" in signal_names:
+        metadata["time"] = {"unit": "s", "quantity": "Time"}
+    return metadata
+
+
 def _accept_simulation_connection(
    server: socket.socket, command_finished: Event
 ) -> socket.socket:
--- a/BEdit/src/bedit/core/simulation/results.py
+++ b/BEdit/src/bedit/core/simulation/results.py
@@ -4,6 +4,7 @@ import zlib
 from dataclasses import asdict, dataclass, field
 from pathlib import Path
 from typing import Any
+from uuid import uuid4

 import msgpack

@@ -25,6 +26,16 @@ class SimulationTrace:
    properties: dict[str, Any] = field(default_factory=dict)


+@dataclass
+class SimulationGraph:
+    """One graph workspace tab and its configured traces."""
+
+    id: str = field(default_factory=lambda: str(uuid4()))
+    title: str = "Graph 1"
+    x_axis: str = "time"
+    traces: list[SimulationTrace] = field(default_factory=list)
+
+
@dataclass
 class SimulationResults:
    """Serializable state displayed by the standalone simulation window."""
@@ -33,7 +44,10 @@ class SimulationResults:
    status: dict[str, Any] = field(default_factory=dict)
    messages: list[dict[str, str]] = field(default_factory=list)
    data: dict[str, list[float]] = field(default_factory=dict)
-    traces: list[SimulationTrace] = field(default_factory=list)
+    signal_metadata: dict[str, dict[str, str]] = field(default_factory=dict)
+    graphs: list[SimulationGraph] = field(
+        default_factory=lambda: [SimulationGraph()]
+    )
    metadata: dict[str, Any] = field(default_factory=dict)

    def to_dict(self) -> dict[str, Any]:
@@ -44,7 +58,11 @@ class SimulationResults:
            "status": dict(self.status),
            "messages": [dict(message) for message in self.messages],
            "data": {name: list(values) for name, values in self.data.items()},
-            "traces": [asdict(trace) for trace in self.traces],
+            "signalMetadata": {
+                name: dict(metadata)
+                for name, metadata in self.signal_metadata.items()
+            },
+            "graphs": [asdict(graph) for graph in self.graphs],
            "metadata": dict(self.metadata),
        }

@@ -55,7 +73,17 @@ class SimulationResults:
        if data.get("version") != RESULTS_VERSION:
            raise ValueError(f"Unsupported simulation-results version: {data.get('version')!r}")
        try:
-            traces = [SimulationTrace(**trace) for trace in data.get("traces", [])]
+            graphs = [
+                SimulationGraph(
+                    id=str(graph["id"]),
+                    title=str(graph["title"]),
+                    x_axis=str(graph.get("x_axis", "time")),
+                    traces=[
+                        SimulationTrace(**trace) for trace in graph.get("traces", [])
+                    ],
+                )
+                for graph in data.get("graphs", [])
+            ]
            return cls(
                model_name=str(data.get("modelName", "")),
                status=dict(data.get("status", {})),
@@ -64,10 +92,19 @@ class SimulationResults:
                    str(name): [float(value) for value in values]
                    for name, values in dict(data.get("data", {})).items()
                },
-                traces=traces,
+                signal_metadata={
+                    str(name): {
+                        str(key): str(value)
+                        for key, value in dict(metadata).items()
+                    }
+                    for name, metadata in dict(
+                        data.get("signalMetadata", {})
+                    ).items()
+                },
+                graphs=graphs,
                metadata=dict(data.get("metadata", {})),
            )
-        except (TypeError, ValueError) as error:
+        except (KeyError, TypeError, ValueError) as error:
            raise ValueError("Malformed simulation-results data") from error


@@ -78,6 +115,7 @@ class SimulationExecutionResult:
    return_code: int
    result_file: str
    data: dict[str, list[float]]
+    signal_metadata: dict[str, dict[str, str]] = field(default_factory=dict)


 def load_openmodelica_csv(path: str | Path) -> dict[str, list[float]]:
--- a/BEdit/src/bedit/core/simulation/service.py
+++ b/BEdit/src/bedit/core/simulation/service.py
@@ -2,9 +2,11 @@ from collections.abc import Callable
 from typing import Any

 from bedit.core.application_log import get_logger
+from bedit.core.bond_graph import infer_causality
 from bedit.core.simulation.composer import compose_graph
 from bedit.core.simulation.openmodelica import (
    ErrorCallback,
+    ModelBuildResult,
    OpenModelicaInterface,
    ResultCallback,
    SimulationMessage,
@@ -43,22 +45,45 @@ class Simulation:
        graph: dict[str, Any],
        callback: Callable[[str], None] | None = None,
        error_callback: ErrorCallback | None = None,
+        message_callback: Callable[[SimulationMessage], None] | None = None,
    ) -> None:
        """Compose and retain the active graph's Modelica representation."""

        self.model_path = None
-
-        # Create openmodelica model
-        result = compose_graph(graph)
-        self.last_composition_input = result.graph
-        self.id_list = result.objects_by_id
-        self.last_composition_output = result.modelica
-        self.model_name = result.model_name
+        self.compose_source(graph)

        def _model_compiled(result):
-            log.info("Compiling OK: %s", result)
+            if not isinstance(result, ModelBuildResult):
+                failure = RuntimeError(
+                    f"OpenModelica returned an invalid build response: {result!r}"
+                )
+                if error_callback is not None:
+                    error_callback(failure)
+                else:
+                    log.error("%s", failure)
+                return
+            log.info("%s", result.check_summary.strip())
+            if message_callback is not None:
+                message_callback(
+                    SimulationMessage(
+                        stream="build",
+                        type="info",
+                        text=result.check_summary.strip(),
+                    )
+                )
+            if result.diagnostics:
+                log.warning("OpenModelica build diagnostics:\n%s", result.diagnostics)
+                if message_callback is not None:
+                    message_callback(
+                        SimulationMessage(
+                            stream="build",
+                            type="warning",
+                            text=result.diagnostics,
+                        )
+                    )
+            log.info("Compiling OK: %s", result.build_result)
            try:
-                self.model_path = str(result[0])
+                self.model_path = str(result.build_result[0])
            except (IndexError, TypeError) as error:
                failure = RuntimeError(
                    f"OpenModelica returned an invalid build result: {result!r}"
@@ -69,6 +94,14 @@ class Simulation:
                else:
                    log.error("%s", failure)
                return
+            if message_callback is not None:
+                message_callback(
+                    SimulationMessage(
+                        stream="build",
+                        type="info",
+                        text=f"Compiling OK: {result.build_result}",
+                    )
+                )
            if callback is not None:
                callback(self.model_path)

@@ -79,6 +112,18 @@ class Simulation:
            error_callback,
        )

+    def compose_source(self, graph: dict[str, Any]) -> tuple[str, str]:
+        """Compose Modelica source without asking OpenModelica to build it."""
+
+        infer_causality(graph)
+        result = compose_graph(graph)
+        self.last_composition_input = result.graph
+        self.id_list = result.objects_by_id
+        self.last_composition_output = result.modelica
+        self.model_name = result.model_name
+        # log.info("Composed OpenModelica model:\n%s", result.modelica)
+        return result.model_name, result.modelica
+
    def run_simulation(
        self,
        graph: dict[str, Any],
@@ -114,7 +159,7 @@ class Simulation:
                error_callback,
            )

-        self.compose(graph, run_model, error_callback)
+        self.compose(graph, run_model, error_callback, message_callback)

    def get_progress(self) -> SimulationProgress | None:
        """Return the most recently received simulation status."""
--- a/BEdit/src/bedit/data/libraries/bondgraph.beb
+++ b/BEdit/src/bedit/data/libraries/bondgraph.beb
--- a/BEdit/src/bedit/data/libraries/default.beb
+++ b/BEdit/src/bedit/data/libraries/default.beb
--- a/BEdit/src/bedit/gui/app.py
+++ b/BEdit/src/bedit/gui/app.py
@@ -1,4 +1,6 @@
 import sys
+from collections.abc import Sequence
+from pathlib import Path

 from PySide6.QtCore import QCoreApplication, Qt
 from PySide6.QtGui import QColor, QPalette
@@ -38,14 +40,26 @@ def apply_light_theme(app: QApplication) -> None:
    app.setPalette(palette)


-def main() -> int:
+def _document_argument(arguments: Sequence[str]) -> Path | None:
+    """Return the first positional application argument, if present."""
+
+    return next(
+        (Path(argument) for argument in arguments[1:] if not argument.startswith("-")),
+        None,
+    )
+
+
+def main(argv: Sequence[str] | None = None) -> int:
    QCoreApplication.setApplicationName("BEdit")
    QCoreApplication.setOrganizationName("BEdit")
    QCoreApplication.setApplicationVersion("0.1.0")
-    app = QApplication(sys.argv)
+    app = QApplication(list(sys.argv if argv is None else argv))
    app.setApplicationDisplayName("BEdit")

    apply_light_theme(app)
    window = MainWindow()
+    document_path = _document_argument(app.arguments())
+    if document_path is not None:
+        window.open_document_path(document_path, check_unsaved=False)
    window.show()
    return app.exec()
--- a/BEdit/src/bedit/gui/controllers/commands.py
+++ b/BEdit/src/bedit/gui/controllers/commands.py
@@ -304,6 +304,20 @@ class RenameConnectionCommand(QUndoCommand):
        self.controller._rename_connection(self.owner_id, self.connection_id, self.old)


+class RenameDocumentCommand(QUndoCommand):
+    def __init__(self, controller, old: str, new: str) -> None:
+        super().__init__("Rename document")
+        self.controller = controller
+        self.old = old
+        self.new = new
+
+    def redo(self) -> None:
+        self.controller._rename_document(self.new)
+
+    def undo(self) -> None:
+        self.controller._rename_document(self.old)
+
+
 class DeleteSelectionCommand(QUndoCommand):
    def __init__(
        self,
@@ -311,24 +325,21 @@ class DeleteSelectionCommand(QUndoCommand):
        owner_id: str | None,
        blocks: dict[str, Component],
        connections: dict[str, Connection],
-        inputs: list[Port],
-        outputs: list[Port],
+        ports: list[Port],
    ) -> None:
        super().__init__("Delete selection")
        self.controller = controller
        self.owner_id = owner_id
        self.blocks = blocks
        self.connections = connections
-        self.inputs = inputs
-        self.outputs = outputs
+        self.ports = ports

    def redo(self) -> None:
        self.controller._delete_items(
            self.owner_id,
            set(self.blocks),
            set(self.connections),
-            {port.id for port in self.inputs},
-            {port.id for port in self.outputs},
+            {port.id for port in self.ports},
        )

    def undo(self) -> None:
@@ -336,8 +347,7 @@ class DeleteSelectionCommand(QUndoCommand):
            self.owner_id,
            self.blocks,
            self.connections,
-            self.inputs,
-            self.outputs,
+            self.ports,
        )


@@ -361,7 +371,6 @@ class PasteSelectionCommand(QUndoCommand):
            self.blocks,
            self.connections,
            [],
-            [],
        )

    def undo(self) -> None:
@@ -370,7 +379,6 @@ class PasteSelectionCommand(QUndoCommand):
            set(self.blocks),
            set(self.connections),
            set(),
-            set(),
        )


--- a/BEdit/src/bedit/gui/controllers/document.py
+++ b/BEdit/src/bedit/gui/controllers/document.py
@@ -23,6 +23,7 @@ from bedit.gui.controllers.commands import (
    MoveInterfacePortCommand,
    PasteSelectionCommand,
    RenameConnectionCommand,
+    RenameDocumentCommand,
    RenameInterfacePortCommand,
    ReplaceSourceCommand,
    RotateComponentsCommand,
@@ -40,14 +41,17 @@ from bedit.core.model import (
    Port,
    clone_component,
 )
+from bedit.core.bond_graph import infer_causality
 from bedit.core.simulation import Simulation
 from bedit.core.port_types import PortTypeRegistry
 from bedit.core.serializer import DocumentSerializer
+from bedit.gui.preferences import application_settings


 class DocumentController(QObject):
    documentReset = Signal()
    documentOpenedChanged = Signal(bool)
+    documentNameChanged = Signal(str)
    activeGraphChanged = Signal()
    componentAdded = Signal(str)
    componentRemoved = Signal(str)
@@ -168,7 +172,13 @@ class DocumentController(QObject):
            name=self._available_component_name(base_name, self.document.roots.values(), number),
            implementation_kind=kind,
            icon=Icon(text="Graph" if kind == "graph" else "Text"),
-            source={"equations": ""} if kind == "text" else {},
+            source={
+                "declarations": "",
+                "initialEquations": "",
+                "equations": "",
+            }
+            if kind == "text"
+            else {},
        )
        self.undo_stack.push(AddComponentCommand(self, None, component))
        self.activate_component(component.id)
@@ -187,7 +197,13 @@ class DocumentController(QObject):
            name=self._available_component_name(base_name, owner.graph.blocks.values(), number),
            implementation_kind=kind,
            icon=Icon(text="Graph" if kind == "graph" else "Text"),
-            source={"equations": ""} if kind == "text" else {},
+            source={
+                "declarations": "",
+                "initialEquations": "",
+                "equations": "",
+            }
+            if kind == "text"
+            else {},
        )
        self.undo_stack.push(AddComponentCommand(self, owner_id, component))
        return component.id
@@ -214,10 +230,19 @@ class DocumentController(QObject):
                {component_id: component},
                connections,
                [],
-                [],
            )
        )

+    def rename_document(self, name: str) -> None:
+        if self.document is None:
+            return
+        name = name.strip()
+        if not name:
+            raise ValueError("The document name cannot be empty")
+        old = str(self.document.metadata.get("name") or "Current Document")
+        if name != old:
+            self.undo_stack.push(RenameDocumentCommand(self, old, name))
+
    def add_component_copy(self, source: Component, position: QPointF) -> str:
        if self.active_component is None or self.active_component.implementation_kind != "graph":
            raise ValueError("Open a graph component before placing components")
@@ -273,7 +298,12 @@ class DocumentController(QObject):
        target_port = self._port_for_endpoint(target, "target")
        if source_port is None or target_port is None:
            raise ValueError("A connection endpoint no longer exists")
-        if not PortTypeRegistry.compatible(source_port.type, target_port.type):
+        if not PortTypeRegistry.compatible(
+            source_port.type,
+            target_port.type,
+            source_port.domain,
+            target_port.domain,
+        ):
            raise ValueError(f"Cannot connect {source_port.type!r} to {target_port.type!r}")
        if not self.endpoint_accepts_connection(source, "source"):
            raise ValueError(
@@ -290,6 +320,7 @@ class DocumentController(QObject):
            properties={
                "waypoints": [{"x": point.x(), "y": point.y()} for point in (waypoints or [])],
            },
+            type=source_port.type,
        )
        self.undo_stack.push(AddConnectionCommand(self, self.active_component_id, connection))
        return connection.id
@@ -307,6 +338,8 @@ class DocumentController(QObject):
        if original is None:
            raise ValueError("The connection no longer exists")
        port_type = self.connection_port_type(original)
+        if port_type == "power":
+            raise ValueError("Power bond connections cannot contain junctions")
        junction = Junction(str(uuid4()), position.x(), position.y(), port_type)
        first_properties = deepcopy(original.properties)
        first_properties["waypoints"] = [
@@ -321,6 +354,8 @@ class DocumentController(QObject):
            Endpoint(junction=junction.id),
            original.name,
            first_properties,
+            original.type,
+            original.causality,
        )
        second = Connection(
            str(uuid4()),
@@ -328,6 +363,8 @@ class DocumentController(QObject):
            original.target,
            "",
            second_properties,
+            original.type,
+            original.causality,
        )
        self.undo_stack.push(
            SplitConnectionCommand(
@@ -425,8 +462,16 @@ class DocumentController(QObject):
        component = self.active_component
        if component is None or component.implementation_kind != "graph":
            raise ValueError("Open a graph component before composing")
+        self._infer_active_graph_causality(component)
        self.simulation.compose(component.to_dict())

+    def compose_active_graph_source(self) -> tuple[str, str]:
+        component = self.active_component
+        if component is None or component.implementation_kind != "graph":
+            raise ValueError("Open a graph component before exporting a model")
+        self._infer_active_graph_causality(component)
+        return self.simulation.compose_source(component.to_dict())
+
    def run_simulation(
        self,
        progress_callback=None,
@@ -437,6 +482,7 @@ class DocumentController(QObject):
        component = self.active_component
        if component is None or component.implementation_kind != "graph":
            raise ValueError("Open a graph component before running a simulation")
+        self._infer_active_graph_causality(component)
        self.simulation.run_simulation(
            component.to_dict(),
            progress_callback,
@@ -445,6 +491,37 @@ class DocumentController(QObject):
            error_callback,
        )

+    def _infer_active_graph_causality(
+        self, component: Component, *, emit_reset: bool = True
+    ) -> None:
+        """Infer causality and copy the derived values into the live model."""
+
+        inferred = infer_causality(component.to_dict())
+        causalities: dict[str, str] = {}
+
+        def collect(serialized_component: dict) -> None:
+            graph = serialized_component.get("implementation", {}).get("graph", {})
+            for connection in graph.get("connections", []):
+                causalities[str(connection["id"])] = str(
+                    connection.get("causality", "none")
+                )
+            for block in graph.get("blocks", []):
+                collect(block)
+
+        collect(inferred)
+        changed = False
+        for nested_component in self._component_subtree(component):
+            for connection in nested_component.graph.connections.values():
+                causality = causalities.get(connection.id, "none")
+                if connection.causality != causality:
+                    connection.causality = causality
+                    changed = True
+        if changed:
+            if self.document is not None:
+                self.document.validate()
+            if emit_reset:
+                self.documentReset.emit()
+
    def set_route_waypoints(self, item_kind: str, item_id: str, waypoints: list[QPointF]) -> None:
        item = (
            self.active_graph.connections
@@ -554,12 +631,26 @@ class DocumentController(QObject):
                allows_multiple_connections=role == "source",
            )
        if endpoint.interface is not None:
-            ports = owner.inputs if role == "source" else owner.outputs
+            orientations = (
+                {"input", "indifferent"}
+                if role == "source"
+                else {"output", "indifferent"}
+            )
+            ports = [
+                port for port in owner.ports if port.orientation in orientations
+            ]
        else:
            component = owner.graph.blocks.get(endpoint.block or "")
            if component is None:
                return None
-            ports = component.outputs if role == "source" else component.inputs
+            orientations = (
+                {"output", "indifferent"}
+                if role == "source"
+                else {"input", "indifferent"}
+            )
+            ports = [
+                port for port in component.ports if port.orientation in orientations
+            ]
        return next(
            (port for port in ports if port.id == (endpoint.interface or endpoint.port)), None
        )
@@ -583,12 +674,13 @@ class DocumentController(QObject):
        component = self.active_component
        if component is None or component.implementation_kind != "graph":
            raise ValueError("Open a graph component before adding an interface")
-        ports = component.inputs if direction == "input" else component.outputs
+        ports = [port for port in component.ports if port.orientation == direction]
        port = Port(
            id=f"{direction}-{uuid4().hex[:8]}",
            name=f"{direction.title()} {len(ports) + 1}",
            x=position.x(),
            y=position.y(),
+            orientation=direction,
        )
        self.undo_stack.push(AddInterfacePortCommand(self, component.id, direction, port))
        return port.id
@@ -603,7 +695,7 @@ class DocumentController(QObject):
        owner = self.active_component
        if owner is None:
            return
-        port = next((p for p in (*owner.inputs, *owner.outputs) if p.id == port_id), None)
+        port = next((port for port in owner.ports if port.id == port_id), None)
        if port is not None and port.name != name:
            self.undo_stack.push(
                RenameInterfacePortCommand(self, owner.id, port_id, port.name, name)
@@ -634,19 +726,26 @@ class DocumentController(QObject):

    def replace_active_text_definition(
        self,
-        inputs: list[Port],
-        outputs: list[Port],
+        ports: list[Port],
+        declarations: str,
+        initial_equations: str,
        equations: str,
        parameters: list[Parameter],
    ) -> None:
        component = self.active_component
        if component is None or component.implementation_kind != "text":
            raise ValueError("Only text-defined components can be edited here")
-        input_ids = [port.id for port in inputs]
-        output_ids = [port.id for port in outputs]
-        if len(set(input_ids)) != len(input_ids) or len(set(output_ids)) != len(output_ids):
-            raise ValueError("Input and output IDs must be unique")
-        if any(not port.name.strip() for port in (*inputs, *outputs)):
+        port_ids = [port.id for port in ports]
+        input_ids = {
+            port.id for port in ports if port.orientation in {"input", "indifferent"}
+        }
+        output_ids = {
+            port.id for port in ports if port.orientation in {"output", "indifferent"}
+        }
+        source_ids = output_ids
+        if len(set(port_ids)) != len(port_ids):
+            raise ValueError("Port IDs must be unique")
+        if any(not port.name.strip() for port in ports):
            raise ValueError("Every port must have a name")
        parameter_ids = [parameter.id for parameter in parameters]
        if len(set(parameter_ids)) != len(parameter_ids):
@@ -666,30 +765,29 @@ class DocumentController(QObject):
                        )
                    if (
                        connection.source.block == component.id
-                        and connection.source.port not in output_ids
+                        and connection.source.port not in source_ids
                    ):
                        raise ValueError(
                            f"Output {connection.source.port!r} is still connected in the containing graph"
                        )
        old = {
-            "inputs": [port.to_dict() for port in component.inputs],
-            "outputs": [port.to_dict() for port in component.outputs],
+            "ports": [port.to_dict() for port in component.ports],
            "source": deepcopy(component.source),
            "parameters": [parameter.to_dict() for parameter in component.parameters],
        }
        new = {
-            "inputs": [port.to_dict() for port in inputs],
-            "outputs": [port.to_dict() for port in outputs],
+            "ports": [port.to_dict() for port in ports],
            "source": {
                "equations": equations,
+                "declarations": declarations,
+                "initialEquations": initial_equations,
            },
            "parameters": [parameter.to_dict() for parameter in parameters],
        }
        if old != new:
            candidate = deepcopy(self.document)
            candidate_component = candidate.find_component(component.id)
-            candidate_component.inputs = deepcopy(inputs)
-            candidate_component.outputs = deepcopy(outputs)
+            candidate_component.ports = deepcopy(ports)
            candidate_component.source = deepcopy(new["source"])
            candidate_component.parameters = deepcopy(parameters)
            candidate.validate()
@@ -700,8 +798,7 @@ class DocumentController(QObject):
        component_id: str,
        name: str,
        icon: Icon,
-        inputs: list[Port],
-        outputs: list[Port],
+        ports: list[Port],
        show_subtree: bool,
        show_name: bool,
    ) -> None:
@@ -716,8 +813,7 @@ class DocumentController(QObject):
        old = {
            "name": component.name,
            "icon": component.icon.to_dict(),
-            "inputs": [port.to_dict() for port in component.inputs],
-            "outputs": [port.to_dict() for port in component.outputs],
+            "ports": [port.to_dict() for port in component.ports],
            "show_subtree": component.show_subtree_in_library,
            "properties": deepcopy(component.properties),
        }
@@ -729,8 +825,7 @@ class DocumentController(QObject):
        new = {
            "name": name,
            "icon": icon.to_dict(),
-            "inputs": [port.to_dict() for port in inputs],
-            "outputs": [port.to_dict() for port in outputs],
+            "ports": [port.to_dict() for port in ports],
            "show_subtree": show_subtree,
            "properties": properties,
        }
@@ -739,8 +834,7 @@ class DocumentController(QObject):
            candidate_component = candidate.find_component(component_id)
            candidate_component.name = name
            candidate_component.icon = Icon.from_dict(icon.to_dict())
-            candidate_component.inputs = deepcopy(inputs)
-            candidate_component.outputs = deepcopy(outputs)
+            candidate_component.ports = deepcopy(ports)
            candidate_component.properties = deepcopy(properties)
            candidate.validate()
            self.undo_stack.push(EditComponentAppearanceCommand(self, component_id, old, new))
@@ -810,16 +904,19 @@ class DocumentController(QObject):
                )
            )

-    def edit_component_ports(
-        self, component_id: str, inputs: list[Port], outputs: list[Port]
-    ) -> None:
+    def edit_component_ports(self, component_id: str, ports: list[Port]) -> None:
        if self.document is None:
            return
        component = self.document.find_component(component_id)
        if component is None:
            return
-        input_ids = {port.id for port in inputs}
-        output_ids = {port.id for port in outputs}
+        input_ids = {
+            port.id for port in ports if port.orientation in {"input", "indifferent"}
+        }
+        output_ids = {
+            port.id for port in ports if port.orientation in {"output", "indifferent"}
+        }
+        source_ids = output_ids
        parent = self.document.find_parent(component_id)
        if parent is not None:
            for connection in parent.graph.connections.values():
@@ -830,7 +927,7 @@ class DocumentController(QObject):
                    raise ValueError("An input cannot be removed or reoriented while connected")
                if (
                    connection.source.block == component_id
-                    and connection.source.port not in output_ids
+                    and connection.source.port not in source_ids
                ):
                    raise ValueError("An output cannot be removed or reoriented while connected")
        for connection in component.graph.connections.values():
@@ -840,21 +937,18 @@ class DocumentController(QObject):
                raise ValueError("An interface output cannot be removed while connected")
        candidate = deepcopy(self.document)
        candidate_component = candidate.find_component(component_id)
-        candidate_component.inputs = deepcopy(inputs)
-        candidate_component.outputs = deepcopy(outputs)
+        candidate_component.ports = deepcopy(ports)
        candidate.validate()
        old = {
            "name": component.name,
            "icon": component.icon.to_dict(),
-            "inputs": [port.to_dict() for port in component.inputs],
-            "outputs": [port.to_dict() for port in component.outputs],
+            "ports": [port.to_dict() for port in component.ports],
            "show_subtree": component.show_subtree_in_library,
            "properties": deepcopy(component.properties),
        }
        new = {
            **old,
-            "inputs": [port.to_dict() for port in inputs],
-            "outputs": [port.to_dict() for port in outputs],
+            "ports": [port.to_dict() for port in ports],
        }
        if old != new:
            self.undo_stack.push(EditComponentAppearanceCommand(self, component_id, old, new))
@@ -884,8 +978,7 @@ class DocumentController(QObject):
        self,
        block_ids: set[str],
        connection_ids: set[str],
-        input_ids: set[str],
-        output_ids: set[str],
+        port_ids: set[str],
    ) -> None:
        component = self.active_component
        if component is None or component.implementation_kind != "graph":
@@ -896,8 +989,8 @@ class DocumentController(QObject):
            if (
                connection.source.block in block_ids
                or connection.target.block in block_ids
-                or connection.source.interface in input_ids
-                or connection.target.interface in output_ids
+                or connection.source.interface in port_ids
+                or connection.target.interface in port_ids
            ):
                all_connection_ids.add(connection.id)
        blocks = {
@@ -908,9 +1001,8 @@ class DocumentController(QObject):
            for connection_id in all_connection_ids
            if connection_id in graph.connections
        }
-        inputs = [port for port in component.inputs if port.id in input_ids]
-        outputs = [port for port in component.outputs if port.id in output_ids]
-        if not (blocks or connections or inputs or outputs):
+        ports = [port for port in component.ports if port.id in port_ids]
+        if not (blocks or connections or ports):
            return
        self.undo_stack.push(
            DeleteSelectionCommand(
@@ -918,8 +1010,7 @@ class DocumentController(QObject):
                component.id,
                blocks,
                connections,
-                inputs,
-                outputs,
+                ports,
            )
        )

@@ -957,6 +1048,8 @@ class DocumentController(QObject):
                target=Endpoint(block=id_map[source.target.block], port=source.target.port),
                name=source.name,
                properties=properties,
+                type=source.type,
+                causality=source.causality,
            )
            connections[connection.id] = connection
        if blocks:
@@ -1017,6 +1110,8 @@ class DocumentController(QObject):
                    ),
                    name=source.name,
                    properties=properties,
+                    type=source.type,
+                    causality=source.causality,
                )
                connections[connection.id] = connection

@@ -1095,6 +1190,10 @@ class DocumentController(QObject):

    def _insert_connection(self, owner_id: str, connection: Connection) -> None:
        self._graph_for(owner_id).connections[connection.id] = connection
+        if self.document is not None and self._infer_causality_on_connection_change():
+            owner = self.document.find_component(owner_id)
+            if owner is not None:
+                self._infer_active_graph_causality(owner, emit_reset=False)
        if owner_id == self.active_component_id:
            self.connectionAdded.emit(connection.id)
        self.documentReset.emit()
@@ -1131,10 +1230,20 @@ class DocumentController(QObject):

    def _remove_connection(self, owner_id: str, connection_id: str) -> None:
        self._graph_for(owner_id).connections.pop(connection_id, None)
+        if self.document is not None and self._infer_causality_on_connection_change():
+            owner = self.document.find_component(owner_id)
+            if owner is not None:
+                self._infer_active_graph_causality(owner, emit_reset=False)
        if owner_id == self.active_component_id:
            self.connectionRemoved.emit(connection_id)
        self.documentReset.emit()

+    @staticmethod
+    def _infer_causality_on_connection_change() -> bool:
+        return application_settings().value(
+            "bondGraph/inferCausalityOnConnectionChange", True, type=bool
+        )
+
    def _insert_annotation(self, owner_id: str, annotation: Annotation) -> None:
        self._graph_for(owner_id).annotations[annotation.id] = annotation
        if owner_id == self.active_component_id:
@@ -1232,9 +1341,9 @@ class DocumentController(QObject):
        owner = self.document.find_component(owner_id)
        if owner is None:
            return
-        ports = owner.inputs if direction == "input" else owner.outputs
-        if all(existing.id != port.id for existing in ports):
-            ports.append(port)
+        port.orientation = direction
+        if all(existing.id != port.id for existing in owner.ports):
+            owner.ports.append(port)
        self.interfaceChanged.emit()
        self.documentReset.emit()

@@ -1244,8 +1353,7 @@ class DocumentController(QObject):
        owner = self.document.find_component(owner_id)
        if owner is None:
            return
-        ports = owner.inputs if direction == "input" else owner.outputs
-        ports[:] = [port for port in ports if port.id != port_id]
+        owner.ports[:] = [port for port in owner.ports if port.id != port_id]
        self.interfaceChanged.emit()
        self.documentReset.emit()

@@ -1255,7 +1363,7 @@ class DocumentController(QObject):
        owner = self.document.find_component(owner_id)
        if owner is None:
            return
-        port = next((p for p in (*owner.inputs, *owner.outputs) if p.id == port_id), None)
+        port = next((port for port in owner.ports if port.id == port_id), None)
        if port is not None:
            port.x, port.y = position.x(), position.y()
        self.interfaceChanged.emit()
@@ -1265,7 +1373,7 @@ class DocumentController(QObject):
        owner = self.document.find_component(owner_id) if self.document else None
        if owner is None:
            return
-        port = next((p for p in (*owner.inputs, *owner.outputs) if p.id == port_id), None)
+        port = next((port for port in owner.ports if port.id == port_id), None)
        if port is not None:
            port.name = name
            self.interfaceChanged.emit()
@@ -1277,6 +1385,12 @@ class DocumentController(QObject):
            connection.name = name
            self.documentReset.emit()

+    def _rename_document(self, name: str) -> None:
+        if self.document is None:
+            return
+        self.document.metadata["name"] = name
+        self.documentNameChanged.emit(name)
+
    def _replace_source(self, component_id: str, source: dict) -> None:
        if self.document is None:
            return
@@ -1296,8 +1410,7 @@ class DocumentController(QObject):
            return
        component.name = values["name"]
        component.icon = Icon.from_dict(values["icon"])
-        component.inputs = [Port.from_dict(port) for port in values["inputs"]]
-        component.outputs = [Port.from_dict(port) for port in values["outputs"]]
+        component.ports = [Port.from_dict(port) for port in values["ports"]]
        component.show_subtree_in_library = values["show_subtree"]
        component.properties = deepcopy(values["properties"])
        self.documentReset.emit()
@@ -1328,8 +1441,7 @@ class DocumentController(QObject):
        owner_id: str | None,
        block_ids: set[str],
        connection_ids: set[str],
-        input_ids: set[str],
-        output_ids: set[str],
+        port_ids: set[str],
    ) -> None:
        if self.document is None:
            return
@@ -1352,8 +1464,7 @@ class DocumentController(QObject):
                owner.graph.blocks.pop(block_id, None)
            for connection_id in connection_ids:
                owner.graph.connections.pop(connection_id, None)
-            owner.inputs[:] = [port for port in owner.inputs if port.id not in input_ids]
-            owner.outputs[:] = [port for port in owner.outputs if port.id not in output_ids]
+            owner.ports[:] = [port for port in owner.ports if port.id not in port_ids]
        if active_was_deleted:
            self.active_component_id = owner_id or next(iter(self.document.roots), None)
            self.activeGraphChanged.emit()
@@ -1364,8 +1475,7 @@ class DocumentController(QObject):
        owner_id: str | None,
        blocks: dict[str, Component],
        connections: dict[str, Connection],
-        inputs: list[Port],
-        outputs: list[Port],
+        ports: list[Port],
    ) -> None:
        if self.document is None:
            return
@@ -1377,10 +1487,8 @@ class DocumentController(QObject):
                return
            owner.graph.blocks.update(blocks)
            owner.graph.connections.update(connections)
-            existing_inputs = {port.id for port in owner.inputs}
-            existing_outputs = {port.id for port in owner.outputs}
-            owner.inputs.extend(port for port in inputs if port.id not in existing_inputs)
-            owner.outputs.extend(port for port in outputs if port.id not in existing_outputs)
+            existing_ports = {port.id for port in owner.ports}
+            owner.ports.extend(port for port in ports if port.id not in existing_ports)
        self.documentReset.emit()

    @staticmethod
@@ -1395,8 +1503,7 @@ class DocumentController(QObject):
        component = self.document.find_component(component_id)
        if component is None:
            return
-        component.inputs = [Port.from_dict(item) for item in values["inputs"]]
-        component.outputs = [Port.from_dict(item) for item in values["outputs"]]
+        component.ports = [Port.from_dict(item) for item in values["ports"]]
        component.source = deepcopy(values["source"])
        component.parameters = [
            Parameter.from_dict(item) for item in values.get("parameters", [])
--- a/BEdit/src/bedit/gui/dialogs/component_options.py
+++ b/BEdit/src/bedit/gui/dialogs/component_options.py
@@ -12,8 +12,7 @@ class ComponentOptionsDialog(QDialog):
        self.ui.setupUi(self)
        self.component = component
        self.edited_icon = component.icon
-        self.edited_inputs = component.inputs
-        self.edited_outputs = component.outputs
+        self.edited_ports = component.ports
        self.ui.nameEdit.setText(component.name)
        self.ui.editIconButton.clicked.connect(self.edit_icon)
        self.ui.showSubtreeCheckBox.setChecked(component.show_subtree_in_library)
@@ -22,13 +21,11 @@ class ComponentOptionsDialog(QDialog):
    def edit_icon(self) -> None:
        working = Component.from_dict(self.component.to_dict())
        working.icon = self.edited_icon
-        working.inputs = self.edited_inputs
-        working.outputs = self.edited_outputs
+        working.ports = self.edited_ports
        dialog = IconEditorDialog(working, self)
        if dialog.exec() == dialog.DialogCode.Accepted:
            self.edited_icon = dialog.icon
-            self.edited_inputs = dialog.inputs
-            self.edited_outputs = dialog.outputs
+            self.edited_ports = dialog.ports

    def accept(self) -> None:
        if not self.ui.nameEdit.text().strip():
--- a/BEdit/src/bedit/gui/dialogs/parameter_options.py
+++ b/BEdit/src/bedit/gui/dialogs/parameter_options.py
@@ -1,10 +1,11 @@
 from copy import deepcopy
 from uuid import uuid4

-from PySide6.QtCore import Qt
+from PySide6.QtCore import Qt, Signal
 from PySide6.QtWidgets import QDialog, QListWidgetItem, QMessageBox

 from bedit.core.model import Component, Parameter
+from bedit.core.physical_types import QUANTITIES, UNITS
 from bedit.gui.generated.ui_parameter_options_dialog import Ui_ParameterOptionsDialog


@@ -14,6 +15,8 @@ PARAMETER_ROLE = Qt.ItemDataRole.UserRole
 class ParameterOptionsDialog(QDialog):
    """Editor for parameters shared by graph and text components."""

+    edited = Signal()
+
    def __init__(self, component: Component, parent=None, *, read_only: bool = False) -> None:
        super().__init__(parent)
        self.ui = Ui_ParameterOptionsDialog()
@@ -22,19 +25,31 @@ class ParameterOptionsDialog(QDialog):
        self.parameters = deepcopy(component.parameters)
        self.read_only = read_only
        self._loading = False
+        self.ui.quantityCombo.addItems(QUANTITIES)
+        self.ui.unitCombo.addItems(UNITS)
        self.ui.parameterList.currentRowChanged.connect(self._load_current)
        self.ui.addParameterButton.clicked.connect(self.add_parameter)
        self.ui.removeParameterButton.clicked.connect(self.remove_parameter)
        self.ui.nameEdit.textEdited.connect(self._store_current)
-        self.ui.typeEdit.textEdited.connect(self._store_current)
+        self.ui.typeCombo.currentTextChanged.connect(self._store_current)
        self.ui.valueEdit.textEdited.connect(self._store_current)
+        self.ui.quantityCombo.currentTextChanged.connect(self._store_current)
+        self.ui.unitCombo.currentTextChanged.connect(self._store_current)
+        self.ui.rowsSpin.valueChanged.connect(self._store_current)
+        self.ui.columnsSpin.valueChanged.connect(self._store_current)
+        self.ui.descriptionEdit.textChanged.connect(self._store_current)
        self.ui.parameterSplitter.setSizes([250, 370])
        if read_only:
            self.ui.addParameterButton.setEnabled(False)
            self.ui.removeParameterButton.setEnabled(False)
            self.ui.nameEdit.setReadOnly(True)
-            self.ui.typeEdit.setReadOnly(True)
+            self.ui.typeCombo.setEnabled(False)
            self.ui.valueEdit.setReadOnly(True)
+            self.ui.quantityCombo.setEnabled(False)
+            self.ui.unitCombo.setEnabled(False)
+            self.ui.rowsSpin.setEnabled(False)
+            self.ui.columnsSpin.setEnabled(False)
+            self.ui.descriptionEdit.setReadOnly(True)
        self._rebuild_list(0 if self.parameters else -1)

    def _rebuild_list(self, row: int = -1) -> None:
@@ -51,12 +66,20 @@ class ParameterOptionsDialog(QDialog):
        if 0 <= row < len(self.parameters):
            parameter = self.parameters[row]
            self.ui.nameEdit.setText(parameter.name)
-            self.ui.typeEdit.setText(parameter.type)
+            self.ui.typeCombo.setCurrentText(parameter.type)
            self.ui.valueEdit.setText(parameter.value)
+            self.ui.quantityCombo.setCurrentText(parameter.quantity)
+            self.ui.unitCombo.setCurrentText(parameter.unit)
+            self.ui.rowsSpin.setValue(parameter.rows)
+            self.ui.columnsSpin.setValue(parameter.columns)
+            self.ui.descriptionEdit.setPlainText(parameter.description)
        else:
            self.ui.nameEdit.clear()
-            self.ui.typeEdit.clear()
+            self.ui.typeCombo.setCurrentText("")
            self.ui.valueEdit.clear()
+            self.ui.quantityCombo.setCurrentText("")
+            self.ui.unitCombo.setCurrentText("")
+            self.ui.descriptionEdit.clear()
        self._loading = False
        self._update_enabled()

@@ -64,8 +87,13 @@ class ParameterOptionsDialog(QDialog):
        enabled = self.ui.parameterList.currentRow() >= 0
        self.ui.removeParameterButton.setEnabled(enabled and not self.read_only)
        self.ui.nameEdit.setEnabled(enabled)
-        self.ui.typeEdit.setEnabled(enabled)
+        self.ui.typeCombo.setEnabled(enabled and not self.read_only)
        self.ui.valueEdit.setEnabled(enabled)
+        self.ui.quantityCombo.setEnabled(enabled and not self.read_only)
+        self.ui.unitCombo.setEnabled(enabled and not self.read_only)
+        self.ui.rowsSpin.setEnabled(enabled and not self.read_only)
+        self.ui.columnsSpin.setEnabled(enabled and not self.read_only)
+        self.ui.descriptionEdit.setEnabled(enabled)

    def _store_current(self) -> None:
        row = self.ui.parameterList.currentRow()
@@ -73,11 +101,23 @@ class ParameterOptionsDialog(QDialog):
            return
        parameter = self.parameters[row]
        parameter.name = self.ui.nameEdit.text()
-        parameter.type = self.ui.typeEdit.text()
+        parameter.type = self.ui.typeCombo.currentText().strip() or "real"
        parameter.value = self.ui.valueEdit.text()
+        parameter.quantity = self.ui.quantityCombo.currentText().strip()
+        parameter.unit = self.ui.unitCombo.currentText().strip()
+        parameter.rows = self.ui.rowsSpin.value()
+        parameter.columns = self.ui.columnsSpin.value()
+        parameter.description = self.ui.descriptionEdit.toPlainText()
        self.ui.parameterList.item(row).setText(
            f"{parameter.name}   [{parameter.type}] = {parameter.value}"
        )
+        self.edited.emit()
+
+    def set_parameters(self, parameters: list[Parameter]) -> None:
+        self._loading = True
+        self.parameters = deepcopy(parameters)
+        self._loading = False
+        self._rebuild_list(0 if self.parameters else -1)

    def add_parameter(self) -> None:
        self.parameters.append(
@@ -89,12 +129,14 @@ class ParameterOptionsDialog(QDialog):
        self._rebuild_list(len(self.parameters) - 1)
        self.ui.nameEdit.selectAll()
        self.ui.nameEdit.setFocus()
+        self.edited.emit()

    def remove_parameter(self) -> None:
        row = self.ui.parameterList.currentRow()
        if row >= 0:
            self.parameters.pop(row)
            self._rebuild_list(min(row, len(self.parameters) - 1))
+            self.edited.emit()

    def accept(self) -> None:
        self._store_current()
@@ -106,3 +148,12 @@ class ParameterOptionsDialog(QDialog):
            QMessageBox.warning(self, "Invalid parameter", "Parameter names must be unique.")
            return
        super().accept()
+
+
+class ParameterEditor(ParameterOptionsDialog):
+    """The parameter options editor embedded without dialog buttons."""
+
+    def __init__(self, parent=None) -> None:
+        super().__init__(Component(id="embedded-parameter-editor", name="Parameters"), parent)
+        self.setWindowFlags(Qt.WindowType.Widget)
+        self.ui.buttonBox.hide()
--- a/BEdit/src/bedit/gui/dialogs/port_options.py
+++ b/BEdit/src/bedit/gui/dialogs/port_options.py
@@ -1,10 +1,12 @@
 from copy import deepcopy
 from uuid import uuid4

-from PySide6.QtCore import Qt
+from PySide6.QtCore import Qt, Signal
 from PySide6.QtWidgets import QDialog, QDialogButtonBox, QListWidgetItem, QMessageBox

 from bedit.core.model import Component, Port
+from bedit.core.physical_types import QUANTITIES, UNITS
+from bedit.core.power_domains import POWER_DOMAINS, power_causalities, power_domain
 from bedit.core.port_types import PortTypeRegistry
 from bedit.gui.generated.ui_port_options_dialog import Ui_PortOptionsDialog

@@ -15,28 +17,45 @@ PORT_ROLE = Qt.ItemDataRole.UserRole
 class PortOptionsDialog(QDialog):
    """Unified editor for a component's typed, oriented ports."""

+    edited = Signal()
+
    def __init__(self, component: Component, parent=None, *, read_only: bool = False) -> None:
        super().__init__(parent)
        self.ui = Ui_PortOptionsDialog()
        self.ui.setupUi(self)
        self.setWindowTitle(f"Port Options — {component.name}")
-        self.ports: list[tuple[Port, str]] = [
-            *((deepcopy(port), "input") for port in component.inputs),
-            *((deepcopy(port), "output") for port in component.outputs),
-        ]
+        self.read_only = read_only
+        self.ports = deepcopy(component.ports)
        self._loading = False
        self.ui.typeCombo.clear()
        for port_type in PortTypeRegistry.all():
            self.ui.typeCombo.addItem(port_type.display_name, port_type.id)
+        self.ui.quantityCombo.addItems(QUANTITIES)
+        self.ui.unitCombo.addItems(UNITS)
        self.ui.orientationCombo.setItemData(0, "input")
        self.ui.orientationCombo.setItemData(1, "output")
+        self.ui.orientationCombo.setItemData(2, "indifferent")
+        for domain in POWER_DOMAINS:
+            self.ui.domainCombo.addItem(domain.display_name, domain.id)
+        self._refresh_causality_options()
        self.ui.portList.currentRowChanged.connect(self._load_current)
        self.ui.addPortButton.clicked.connect(self.add_port)
        self.ui.removePortButton.clicked.connect(self.remove_port)
        self.ui.nameEdit.textEdited.connect(self._store_current)
-        self.ui.typeCombo.currentIndexChanged.connect(self._store_current)
+        self.ui.typeCombo.currentIndexChanged.connect(self._port_type_changed)
        self.ui.orientationCombo.currentIndexChanged.connect(self._store_current)
-        self.ui.multipleConnectionsCheckBox.toggled.connect(self._store_current)
+        self.ui.multipleConnectionsCheckBox.toggled.connect(
+            self._multiple_connections_changed
+        )
+        self.ui.valueTypeCombo.currentTextChanged.connect(self._store_current)
+        self.ui.quantityCombo.currentTextChanged.connect(self._store_current)
+        self.ui.unitCombo.currentTextChanged.connect(self._store_current)
+        self.ui.rowsSpin.valueChanged.connect(self._store_current)
+        self.ui.columnsSpin.valueChanged.connect(self._store_current)
+        self.ui.descriptionEdit.textChanged.connect(self._store_current)
+        self.ui.domainCombo.currentIndexChanged.connect(self._power_domain_changed)
+        self.ui.causalityCombo.currentTextChanged.connect(self._store_current)
+        self.ui.powerDescriptionEdit.textChanged.connect(self._store_current)
        self.ui.portSplitter.setSizes([250, 370])
        if read_only:
            self.ui.addPortButton.setEnabled(False)
@@ -45,22 +64,15 @@ class PortOptionsDialog(QDialog):
            self.ui.typeCombo.setEnabled(False)
            self.ui.orientationCombo.setEnabled(False)
            self.ui.multipleConnectionsCheckBox.setEnabled(False)
+            self.ui.typeOptionsStack.setEnabled(False)
            self.ui.buttonBox.button(QDialogButtonBox.StandardButton.Ok).setText("Close")
            self.ui.buttonBox.button(QDialogButtonBox.StandardButton.Cancel).hide()
        self._rebuild_list(0 if self.ports else -1)

-    @property
-    def inputs(self) -> list[Port]:
-        return [port for port, orientation in self.ports if orientation == "input"]
-
-    @property
-    def outputs(self) -> list[Port]:
-        return [port for port, orientation in self.ports if orientation == "output"]
-
    def _rebuild_list(self, row: int = -1) -> None:
        self.ui.portList.clear()
-        for port, orientation in self.ports:
-            item = QListWidgetItem(f"{port.name}   [{orientation}, {port.type}]")
+        for port in self.ports:
+            item = QListWidgetItem(f"{port.name}   [{port.orientation}, {port.type}]")
            item.setData(PORT_ROLE, port.id)
            self.ui.portList.addItem(item)
        self.ui.portList.setCurrentRow(min(row, len(self.ports) - 1))
@@ -70,38 +82,125 @@ class PortOptionsDialog(QDialog):
        self._loading = True
        enabled = 0 <= row < len(self.ports)
        if enabled:
-            port, orientation = self.ports[row]
+            port = self.ports[row]
            self.ui.nameEdit.setText(port.name)
            self.ui.typeCombo.setCurrentIndex(self.ui.typeCombo.findData(port.type))
-            self.ui.orientationCombo.setCurrentIndex(self.ui.orientationCombo.findData(orientation))
+            self.ui.orientationCombo.setCurrentIndex(
+                self.ui.orientationCombo.findData(port.orientation)
+            )
            self.ui.multipleConnectionsCheckBox.setChecked(
                port.allows_multiple_connections
            )
+            self.ui.valueTypeCombo.setCurrentText(port.value_type)
+            self.ui.quantityCombo.setCurrentText(port.quantity)
+            self.ui.unitCombo.setCurrentText(port.unit)
+            self.ui.rowsSpin.setValue(port.rows)
+            self.ui.columnsSpin.setValue(port.columns)
+            self.ui.descriptionEdit.setPlainText(port.description)
+            self.ui.domainCombo.setCurrentIndex(self.ui.domainCombo.findData(port.domain))
+            self._refresh_causality_options(
+                port.causality,
+                port_type=port.type,
+                allows_multiple_connections=port.allows_multiple_connections,
+            )
+            self.ui.causalityCombo.setCurrentText(port.causality)
+            self.ui.powerDescriptionEdit.setPlainText(port.description)
+            self._show_type_options(port.type)
        else:
            self.ui.nameEdit.clear()
+            self.ui.descriptionEdit.clear()
        self._loading = False
        self._update_enabled()

    def _update_enabled(self) -> None:
        enabled = self.ui.portList.currentRow() >= 0
-        self.ui.removePortButton.setEnabled(enabled)
+        self.ui.removePortButton.setEnabled(enabled and not self.read_only)
        self.ui.nameEdit.setEnabled(enabled)
-        self.ui.typeCombo.setEnabled(enabled)
-        self.ui.orientationCombo.setEnabled(enabled)
-        self.ui.multipleConnectionsCheckBox.setEnabled(enabled)
+        self.ui.typeCombo.setEnabled(enabled and not self.read_only)
+        self.ui.orientationCombo.setEnabled(enabled and not self.read_only)
+        self.ui.multipleConnectionsCheckBox.setEnabled(enabled and not self.read_only)
+        self.ui.typeOptionsStack.setEnabled(enabled and not self.read_only)
+
+    def _port_type_changed(self) -> None:
+        port_type = self.ui.typeCombo.currentData()
+        indifferent_item = self.ui.orientationCombo.model().item(2)
+        indifferent_item.setEnabled(port_type == "power")
+        if port_type != "power" and self.ui.orientationCombo.currentData() == "indifferent":
+            self.ui.orientationCombo.setCurrentIndex(0)
+        self._refresh_causality_options(port_type=port_type)
+        self._show_type_options(port_type)
+        self._store_current()
+
+    def _multiple_connections_changed(self) -> None:
+        self._refresh_causality_options()
+        self._store_current()
+
+    def _refresh_causality_options(
+        self,
+        selected: str | None = None,
+        *,
+        port_type: str | None = None,
+        allows_multiple_connections: bool | None = None,
+    ) -> None:
+        selected = selected or self.ui.causalityCombo.currentText() or "indifferent"
+        port_type = port_type or self.ui.typeCombo.currentData()
+        if allows_multiple_connections is None:
+            allows_multiple_connections = self.ui.multipleConnectionsCheckBox.isChecked()
+        choices = power_causalities(
+            port_type == "power" and allows_multiple_connections
+        )
+        self.ui.causalityCombo.blockSignals(True)
+        self.ui.causalityCombo.clear()
+        self.ui.causalityCombo.addItems(choices)
+        self.ui.causalityCombo.setCurrentText(
+            selected if selected in choices else "indifferent"
+        )
+        self.ui.causalityCombo.blockSignals(False)
+
+    def _show_type_options(self, port_type: str) -> None:
+        self.ui.orientationCombo.model().item(2).setEnabled(port_type == "power")
+        page = {
+            "signal": self.ui.signalOptionsPage,
+            "power": self.ui.powerOptionsPage,
+        }.get(port_type, self.ui.unsupportedTypePage)
+        self.ui.typeOptionsStack.setCurrentWidget(page)
+
+    def _power_domain_changed(self) -> None:
+        domain = power_domain(self.ui.domainCombo.currentData())
+        self.ui.effortValueLabel.setText(domain.effort)
+        self.ui.flowValueLabel.setText(domain.flow)
+        self._store_current()

    def _store_current(self) -> None:
        row = self.ui.portList.currentRow()
        if self._loading or not (0 <= row < len(self.ports)):
            return
-        port, _orientation = self.ports[row]
+        port = self.ports[row]
        port.name = self.ui.nameEdit.text()
        port.type = self.ui.typeCombo.currentData()
        port.allows_multiple_connections = self.ui.multipleConnectionsCheckBox.isChecked()
-        self.ports[row] = (port, self.ui.orientationCombo.currentData())
-        self.ui.portList.item(row).setText(
-            f"{port.name}   [{self.ports[row][1]}, {port.type}]"
+        port.value_type = self.ui.valueTypeCombo.currentText().strip() or "real"
+        port.quantity = self.ui.quantityCombo.currentText().strip()
+        port.unit = self.ui.unitCombo.currentText().strip()
+        port.rows = self.ui.rowsSpin.value()
+        port.columns = self.ui.columnsSpin.value()
+        port.domain = self.ui.domainCombo.currentData() or "power"
+        port.causality = self.ui.causalityCombo.currentText()
+        port.description = (
+            self.ui.powerDescriptionEdit.toPlainText()
+            if port.type == "power"
+            else self.ui.descriptionEdit.toPlainText()
        )
+        orientation = self.ui.orientationCombo.currentData()
+        port.orientation = orientation
+        self.ui.portList.item(row).setText(f"{port.name}   [{port.orientation}, {port.type}]")
+        self.edited.emit()
+
+    def set_ports(self, ports: list[Port]) -> None:
+        self._loading = True
+        self.ports = deepcopy(ports)
+        self._loading = False
+        self._rebuild_list(0 if self.ports else -1)

    def add_port(self) -> None:
        port = Port(
@@ -110,20 +209,31 @@ class PortOptionsDialog(QDialog):
            properties={"iconPosition": {"x": 0.0, "y": 0.0}},
            type="signal",
        )
-        self.ports.append((port, "input"))
+        self.ports.append(port)
        self._rebuild_list(len(self.ports) - 1)
        self.ui.nameEdit.selectAll()
        self.ui.nameEdit.setFocus()
+        self.edited.emit()

    def remove_port(self) -> None:
        row = self.ui.portList.currentRow()
        if row >= 0:
            self.ports.pop(row)
            self._rebuild_list(min(row, len(self.ports) - 1))
+            self.edited.emit()

    def accept(self) -> None:
        self._store_current()
-        if any(not port.name.strip() for port, _orientation in self.ports):
+        if any(not port.name.strip() for port in self.ports):
            QMessageBox.warning(self, "Invalid port", "Every port must have a name.")
            return
        super().accept()
+
+
+class PortEditor(PortOptionsDialog):
+    """The port options editor embedded without dialog confirmation buttons."""
+
+    def __init__(self, parent=None) -> None:
+        super().__init__(Component(id="embedded-port-editor", name="Ports"), parent)
+        self.setWindowFlags(Qt.WindowType.Widget)
+        self.ui.buttonBox.hide()
--- a/BEdit/src/bedit/gui/dialogs/settings.py
+++ b/BEdit/src/bedit/gui/dialogs/settings.py
@@ -47,6 +47,9 @@ class SettingsDialog(QDialog):
        self.ui.graphGridSpinBox.setValue(self.graph_grid_size(self.settings))
        self.ui.graphSnapSpinBox.setValue(self.graph_snap_size(self.settings))
        self.ui.iconGridSpinBox.setValue(self.icon_grid_size(self.settings))
+        self.ui.automaticCausalityCheckBox.setChecked(
+            self.infer_causality_on_connection_change(self.settings)
+        )
        self.ui.openModelicaPathEdit.setText(self.openmodelica_path(self.settings))
        self._load_syntax_styles()
        self._update_remove_button()
@@ -132,6 +135,15 @@ class SettingsDialog(QDialog):
        settings = settings if settings is not None else application_settings()
        return settings.value("grid/iconSize", 8, type=int)

+    @staticmethod
+    def infer_causality_on_connection_change(
+        settings: QSettings | None = None,
+    ) -> bool:
+        settings = settings if settings is not None else application_settings()
+        return settings.value(
+            "bondGraph/inferCausalityOnConnectionChange", True, type=bool
+        )
+
    @staticmethod
    def openmodelica_path(settings: QSettings | None = None) -> str:
        settings = settings if settings is not None else application_settings()
@@ -197,6 +209,10 @@ class SettingsDialog(QDialog):
        self.settings.setValue("grid/graphSize", self.ui.graphGridSpinBox.value())
        self.settings.setValue("grid/graphSnapSize", self.ui.graphSnapSpinBox.value())
        self.settings.setValue("grid/iconSize", self.ui.iconGridSpinBox.value())
+        self.settings.setValue(
+            "bondGraph/inferCausalityOnConnectionChange",
+            self.ui.automaticCausalityCheckBox.isChecked(),
+        )
        self.settings.setValue(
            "simulation/openModelicaPath",
            self.ui.openModelicaPathEdit.text().strip(),
--- a/BEdit/src/bedit/gui/editors/text_definition.py
+++ b/BEdit/src/bedit/gui/editors/text_definition.py
@@ -1,20 +1,12 @@
-from copy import deepcopy
-from uuid import uuid4
-
-from PySide6.QtCore import Qt, Signal
-from PySide6.QtWidgets import QCheckBox, QComboBox, QHeaderView, QTableWidgetItem, QWidget
+from PySide6.QtCore import Signal
+from PySide6.QtWidgets import QWidget

 from bedit.core.model import Parameter, Port
-from bedit.core.port_types import PortTypeRegistry
 from bedit.gui.generated.ui_text_definition_editor import Ui_TextDefinitionEditor


-ID_ROLE = Qt.ItemDataRole.UserRole
-PROPERTIES_ROLE = Qt.ItemDataRole.UserRole + 1
-
-
 class TextDefinitionEditor(QWidget):
-    """Editor for a text component's equations, ports, and parameters."""
+    """Editor for a text component's Modelica source, ports, and parameters."""

    modifiedChanged = Signal(bool)
    definitionEdited = Signal()
@@ -25,24 +17,14 @@ class TextDefinitionEditor(QWidget):
        self.ui.setupUi(self)
        self._modified = False
        self._loading = False
-        self.ui.portsTable.horizontalHeader().setSectionResizeMode(
-            QHeaderView.ResizeMode.Stretch
-        )
-        self.ui.parametersTable.horizontalHeader().setSectionResizeMode(
-            QHeaderView.ResizeMode.Stretch
-        )
        self.ui.columnSplitter.setSizes([560, 340])
+        self.ui.sourceSplitter.setSizes([180, 180, 240])
        self.ui.definitionSplitter.setSizes([300, 300])
+        self.ui.declarationsEdit.textChanged.connect(self._mark_modified)
+        self.ui.initialEquationsEdit.textChanged.connect(self._mark_modified)
        self.ui.equationsEdit.textChanged.connect(self._mark_modified)
-        self.ui.portsTable.cellChanged.connect(self._symbols_modified)
-        self.ui.parametersTable.cellChanged.connect(self._symbols_modified)
-        self.ui.addPortButton.clicked.connect(self.add_port)
-        self.ui.removePortButton.clicked.connect(self.remove_port)
-        self.ui.addParameterButton.clicked.connect(self.add_parameter)
-        self.ui.removeParameterButton.clicked.connect(self.remove_parameter)
-        self.ui.portsTable.itemSelectionChanged.connect(self._update_buttons)
-        self.ui.parametersTable.itemSelectionChanged.connect(self._update_buttons)
-        self._update_buttons()
+        self.ui.portEditor.edited.connect(self._symbols_modified)
+        self.ui.parameterEditor.edited.connect(self._symbols_modified)

    @property
    def is_modified(self) -> bool:
@@ -53,63 +35,38 @@ class TextDefinitionEditor(QWidget):
        return self.ui.equationsEdit.toPlainText()

    @property
-    def ports(self) -> tuple[list[Port], list[Port]]:
-        inputs: list[Port] = []
-        outputs: list[Port] = []
-        for row in range(self.ui.portsTable.rowCount()):
-            name_item = self.ui.portsTable.item(row, 0)
-            type_combo = self.ui.portsTable.cellWidget(row, 1)
-            orientation_combo = self.ui.portsTable.cellWidget(row, 2)
-            multiple_check = self.ui.portsTable.cellWidget(row, 3)
-            port = Port(
-                id=name_item.data(ID_ROLE),
-                name=name_item.text().strip(),
-                type=type_combo.currentData(),
-                properties=deepcopy(name_item.data(PROPERTIES_ROLE) or {}),
-                allows_multiple_connections=multiple_check.isChecked(),
-            )
-            target = inputs if orientation_combo.currentData() == "input" else outputs
-            target.append(port)
-        return inputs, outputs
+    def declarations(self) -> str:
+        return self.ui.declarationsEdit.toPlainText()
+
+    @property
+    def initial_equations(self) -> str:
+        return self.ui.initialEquationsEdit.toPlainText()
+
+    @property
+    def ports(self) -> list[Port]:
+        return self.ui.portEditor.ports

    @property
    def parameters(self) -> list[Parameter]:
-        table = self.ui.parametersTable
-        return [
-            Parameter(
-                id=table.item(row, 0).data(ID_ROLE),
-                name=table.item(row, 0).text().strip(),
-                type=table.item(row, 1).text().strip(),
-                value=table.item(row, 2).text(),
-            )
-            for row in range(table.rowCount())
-        ]
+        return self.ui.parameterEditor.parameters

    def set_definition(
        self,
+        declarations: str,
+        initial_equations: str,
        equations: str,
-        inputs: list[Port],
-        outputs: list[Port],
+        ports: list[Port],
        parameters: list[Parameter],
    ) -> None:
        self._loading = True
+        self.ui.declarationsEdit.setPlainText(declarations)
+        self.ui.initialEquationsEdit.setPlainText(initial_equations)
        self.ui.equationsEdit.setPlainText(equations)
-        self.ui.portsTable.setRowCount(0)
-        for port in inputs:
-            self._append_port(port, "input")
-        for port in outputs:
-            self._append_port(port, "output")
-        self.ui.parametersTable.setRowCount(0)
-        for parameter in parameters:
-            self._append_parameter(parameter)
-        self.ui.equationsEdit.set_symbols(
-            [port.name for port in inputs],
-            [port.name for port in outputs],
-            [parameter.name for parameter in parameters],
-        )
+        self.ui.portEditor.set_ports(ports)
+        self.ui.parameterEditor.set_parameters(parameters)
+        self._set_editor_symbols(ports, parameters)
        self._loading = False
        self.set_modified(False)
-        self._update_buttons()

    def set_modified(self, modified: bool) -> None:
        if self._modified != modified:
@@ -127,91 +84,27 @@ class TextDefinitionEditor(QWidget):
            self._mark_modified()

    def _refresh_editor_symbols(self) -> None:
-        inputs, outputs = self.ports
-        self.ui.equationsEdit.set_symbols(
-            [port.name for port in inputs],
-            [port.name for port in outputs],
-            [parameter.name for parameter in self.parameters],
+        self._set_editor_symbols(self.ports, self.parameters)
+
+    def _set_editor_symbols(
+        self,
+        ports: list[Port],
+        parameters: list[Parameter],
+    ) -> None:
+        self._apply_editor_symbols(
+            [
+                port.name
+                for port in ports
+                if port.orientation in {"input", "indifferent"}
+            ],
+            [port.name for port in ports if port.orientation == "output"],
+            [parameter.name for parameter in parameters],
        )

-    def _new_combo(self, values: list[tuple[str, str]], current: str) -> QComboBox:
-        combo = QComboBox(self)
-        for label, value in values:
-            combo.addItem(label, value)
-        combo.setCurrentIndex(max(0, combo.findData(current)))
-        combo.currentIndexChanged.connect(self._symbols_modified)
-        return combo
-
-    def _append_port(self, port: Port, orientation: str) -> None:
-        table = self.ui.portsTable
-        row = table.rowCount()
-        table.insertRow(row)
-        name = QTableWidgetItem(port.name)
-        name.setData(ID_ROLE, port.id)
-        name.setData(PROPERTIES_ROLE, deepcopy(port.properties))
-        table.setItem(row, 0, name)
-        types = [(item.display_name, item.id) for item in PortTypeRegistry.all()]
-        table.setCellWidget(row, 1, self._new_combo(types, port.type))
-        table.setCellWidget(
-            row,
-            2,
-            self._new_combo([("Input", "input"), ("Output", "output")], orientation),
-        )
-        multiple = QCheckBox("Any", self)
-        multiple.setChecked(port.allows_multiple_connections)
-        multiple.toggled.connect(self._symbols_modified)
-        table.setCellWidget(row, 3, multiple)
-
-    def _append_parameter(self, parameter: Parameter) -> None:
-        table = self.ui.parametersTable
-        row = table.rowCount()
-        table.insertRow(row)
-        name = QTableWidgetItem(parameter.name)
-        name.setData(ID_ROLE, parameter.id)
-        table.setItem(row, 0, name)
-        table.setItem(row, 1, QTableWidgetItem(parameter.type))
-        table.setItem(row, 2, QTableWidgetItem(parameter.value))
-
-    def add_port(self) -> None:
-        port = Port(
-            id=f"port-{uuid4().hex[:8]}",
-            name=f"Port {self.ui.portsTable.rowCount() + 1}",
-            type="signal",
-            properties={"iconPosition": {"x": 0.0, "y": 0.0}},
-        )
-        self._loading = True
-        self._append_port(port, "input")
-        self._loading = False
-        self.ui.portsTable.selectRow(self.ui.portsTable.rowCount() - 1)
-        self._symbols_modified()
-
-    def remove_port(self) -> None:
-        row = self.ui.portsTable.currentRow()
-        if row >= 0:
-            self.ui.portsTable.removeRow(row)
-            self._symbols_modified()
-            self._update_buttons()
-
-    def add_parameter(self) -> None:
-        parameter = Parameter(
-            id=f"parameter-{uuid4().hex[:8]}",
-            name=f"Parameter {self.ui.parametersTable.rowCount() + 1}",
-        )
-        self._loading = True
-        self._append_parameter(parameter)
-        self._loading = False
-        self.ui.parametersTable.selectRow(self.ui.parametersTable.rowCount() - 1)
-        self._symbols_modified()
-
-    def remove_parameter(self) -> None:
-        row = self.ui.parametersTable.currentRow()
-        if row >= 0:
-            self.ui.parametersTable.removeRow(row)
-            self._symbols_modified()
-            self._update_buttons()
-
-    def _update_buttons(self) -> None:
-        self.ui.removePortButton.setEnabled(self.ui.portsTable.currentRow() >= 0)
-        self.ui.removeParameterButton.setEnabled(
-            self.ui.parametersTable.currentRow() >= 0
-        )
+    def _apply_editor_symbols(
+        self, inputs: list[str], outputs: list[str], parameters: list[str]
+    ) -> None:
+        symbols = (inputs, outputs, parameters)
+        self.ui.declarationsEdit.set_symbols(*symbols)
+        self.ui.initialEquationsEdit.set_symbols(*symbols)
+        self.ui.equationsEdit.set_symbols(*symbols)
--- a/BEdit/src/bedit/gui/generated/resources_rc.py
+++ b/BEdit/src/bedit/gui/generated/resources_rc.py
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 `\x82\
+\x00\x00\x04)\
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-\x00\x00\x04P\x00\x00\x00\x00\x00\x01\x00\x00\x99\xa2\
+\x00\x00\x04\x92\x00\x00\x00\x00\x00\x01\x00\x00\xa3\xa2\
 \x00\x00\x01\x9f{{\xa5\xe3\
 \x00\x00\x00^\x00\x00\x00\x00\x00\x01\x00\x00\x0c\xc1\
 \x00\x00\x01\x9f\x7f\xac\xf2\xc6\
 \x00\x00\x01D\x00\x00\x00\x00\x00\x01\x00\x00/{\
 \x00\x00\x01\x9f\x7fV\xd5\xe5\
-\x00\x00\x03|\x00\x00\x00\x00\x00\x01\x00\x00\x88\xb7\
+\x00\x00\x03\xa0\x00\x00\x00\x00\x00\x01\x00\x00\x8c\xe4\
 \x00\x00\x01\x9f{0\xc9R\
 "

--- a/BEdit/src/bedit/gui/generated/ui_main_window.py
+++ b/BEdit/src/bedit/gui/generated/ui_main_window.py
@@ -56,50 +56,53 @@ class Ui_MainWindow(object):
        icon4 = QIcon()
        icon4.addFile(u":/icons/icons/office-chart-line.png", QSize(), QIcon.Mode.Normal, QIcon.State.Off)
        self.actionSimulationWindow.setIcon(icon4)
+        self.actionExportModel = QAction(MainWindow)
+        self.actionExportModel.setObjectName(u"actionExportModel")
+        icon5 = QIcon()
+        icon5.addFile(u":/icons/icons/document-save-as.png", QSize(), QIcon.Mode.Normal, QIcon.State.Off)
+        self.actionExportModel.setIcon(icon5)
        self.actionNew = QAction(MainWindow)
        self.actionNew.setObjectName(u"actionNew")
-        icon5 = QIcon()
-        icon5.addFile(u":/icons/icons/document-new.png", QSize(), QIcon.Mode.Normal, QIcon.State.Off)
-        self.actionNew.setIcon(icon5)
+        icon6 = QIcon()
+        icon6.addFile(u":/icons/icons/document-new.png", QSize(), QIcon.Mode.Normal, QIcon.State.Off)
+        self.actionNew.setIcon(icon6)
        self.actionRotateClockwise = QAction(MainWindow)
        self.actionRotateClockwise.setObjectName(u"actionRotateClockwise")
-        icon6 = QIcon()
-        icon6.addFile(u":/icons/icons/transform-rotate.png", QSize(), QIcon.Mode.Normal, QIcon.State.Off)
-        self.actionRotateClockwise.setIcon(icon6)
+        icon7 = QIcon()
+        icon7.addFile(u":/icons/icons/transform-rotate.png", QSize(), QIcon.Mode.Normal, QIcon.State.Off)
+        self.actionRotateClockwise.setIcon(icon7)
        self.actionZoomIn = QAction(MainWindow)
        self.actionZoomIn.setObjectName(u"actionZoomIn")
-        icon7 = QIcon()
-        icon7.addFile(u":/icons/icons/zoom-in.png", QSize(), QIcon.Mode.Normal, QIcon.State.Off)
-        self.actionZoomIn.setIcon(icon7)
+        icon8 = QIcon()
+        icon8.addFile(u":/icons/icons/zoom-in.png", QSize(), QIcon.Mode.Normal, QIcon.State.Off)
+        self.actionZoomIn.setIcon(icon8)
        self.actionZoomOut = QAction(MainWindow)
        self.actionZoomOut.setObjectName(u"actionZoomOut")
-        icon8 = QIcon()
-        icon8.addFile(u":/icons/icons/zoom-out.png", QSize(), QIcon.Mode.Normal, QIcon.State.Off)
-        self.actionZoomOut.setIcon(icon8)
+        icon9 = QIcon()
+        icon9.addFile(u":/icons/icons/zoom-out.png", QSize(), QIcon.Mode.Normal, QIcon.State.Off)
+        self.actionZoomOut.setIcon(icon9)
        self.actionCenterView = QAction(MainWindow)
        self.actionCenterView.setObjectName(u"actionCenterView")
-        icon9 = QIcon()
-        icon9.addFile(u":/icons/icons/zoom-original.png", QSize(), QIcon.Mode.Normal, QIcon.State.Off)
-        self.actionCenterView.setIcon(icon9)
+        icon10 = QIcon()
+        icon10.addFile(u":/icons/icons/zoom-original.png", QSize(), QIcon.Mode.Normal, QIcon.State.Off)
+        self.actionCenterView.setIcon(icon10)
        self.actionOpen = QAction(MainWindow)
        self.actionOpen.setObjectName(u"actionOpen")
-        icon10 = QIcon()
-        icon10.addFile(u":/icons/icons/document-open.png", QSize(), QIcon.Mode.Normal, QIcon.State.Off)
-        self.actionOpen.setIcon(icon10)
+        icon11 = QIcon()
+        icon11.addFile(u":/icons/icons/document-open.png", QSize(), QIcon.Mode.Normal, QIcon.State.Off)
+        self.actionOpen.setIcon(icon11)
        self.actionReloadLibraries = QAction(MainWindow)
        self.actionReloadLibraries.setObjectName(u"actionReloadLibraries")
        self.actionReloadSimulation = QAction(MainWindow)
        self.actionReloadSimulation.setObjectName(u"actionReloadSimulation")
        self.actionSave = QAction(MainWindow)
        self.actionSave.setObjectName(u"actionSave")
-        icon11 = QIcon()
-        icon11.addFile(u":/icons/icons/document-save.png", QSize(), QIcon.Mode.Normal, QIcon.State.Off)
-        self.actionSave.setIcon(icon11)
+        icon12 = QIcon()
+        icon12.addFile(u":/icons/icons/document-save.png", QSize(), QIcon.Mode.Normal, QIcon.State.Off)
+        self.actionSave.setIcon(icon12)
        self.actionSaveAs = QAction(MainWindow)
        self.actionSaveAs.setObjectName(u"actionSaveAs")
-        icon12 = QIcon()
-        icon12.addFile(u":/icons/icons/document-save-as.png", QSize(), QIcon.Mode.Normal, QIcon.State.Off)
-        self.actionSaveAs.setIcon(icon12)
+        self.actionSaveAs.setIcon(icon5)
        self.actionExit = QAction(MainWindow)
        self.actionExit.setObjectName(u"actionExit")
        self.actionClose = QAction(MainWindow)
@@ -295,7 +298,7 @@ class Ui_MainWindow(object):

        self.rotateToolButton = QToolButton(self.workspaceHeader)
        self.rotateToolButton.setObjectName(u"rotateToolButton")
-        self.rotateToolButton.setIcon(icon6)
+        self.rotateToolButton.setIcon(icon7)

        self.workspaceHeaderLayout.addWidget(self.rotateToolButton)

@@ -441,6 +444,7 @@ class Ui_MainWindow(object):
        self.menuSimulation.addAction(self.actionSimulationSettings)
        self.menuSimulation.addAction(self.actionGraphParameters)
        self.menuSimulation.addAction(self.actionCompose)
+        self.menuSimulation.addAction(self.actionExportModel)
        self.menuSimulation.addAction(self.actionSimulationWindow)
        self.menuSimulation.addAction(self.actionRunSimulation)
        self.fileToolbar.addAction(self.actionNew)
@@ -496,6 +500,10 @@ class Ui_MainWindow(object):
        self.actionSimulationWindow.setText(QCoreApplication.translate("MainWindow", u"Simulation Window", None))
 #if QT_CONFIG(statustip)
        self.actionSimulationWindow.setStatusTip(QCoreApplication.translate("MainWindow", u"Show the simulation results window", None))
+#endif // QT_CONFIG(statustip)
+        self.actionExportModel.setText(QCoreApplication.translate("MainWindow", u"Export Model\u2026", None))
+#if QT_CONFIG(statustip)
+        self.actionExportModel.setStatusTip(QCoreApplication.translate("MainWindow", u"Save the composed OpenModelica model to a file", None))
 #endif // QT_CONFIG(statustip)
        self.actionNew.setText(QCoreApplication.translate("MainWindow", u"&New", None))
 #if QT_CONFIG(statustip)
--- a/BEdit/src/bedit/gui/generated/ui_parameter_options_dialog.py
+++ b/BEdit/src/bedit/gui/generated/ui_parameter_options_dialog.py
@@ -15,16 +15,17 @@ from PySide6.QtGui import (QBrush, QColor, QConicalGradient, QCursor,
    QFont, QFontDatabase, QGradient, QIcon,
    QImage, QKeySequence, QLinearGradient, QPainter,
    QPalette, QPixmap, QRadialGradient, QTransform)
-from PySide6.QtWidgets import (QAbstractButton, QApplication, QDialog, QDialogButtonBox,
-    QFormLayout, QHBoxLayout, QLabel, QLineEdit,
-    QListWidget, QListWidgetItem, QPushButton, QSizePolicy,
-    QSplitter, QVBoxLayout, QWidget)
+from PySide6.QtWidgets import (QAbstractButton, QApplication, QComboBox, QDialog,
+    QDialogButtonBox, QFormLayout, QHBoxLayout, QLabel,
+    QLineEdit, QListWidget, QListWidgetItem, QPlainTextEdit,
+    QPushButton, QSizePolicy, QSpinBox, QSplitter,
+    QVBoxLayout, QWidget)

 class Ui_ParameterOptionsDialog(object):
    def setupUi(self, ParameterOptionsDialog):
        if not ParameterOptionsDialog.objectName():
            ParameterOptionsDialog.setObjectName(u"ParameterOptionsDialog")
-        ParameterOptionsDialog.resize(620, 380)
+        ParameterOptionsDialog.resize(720, 500)
        self.dialogLayout = QVBoxLayout(ParameterOptionsDialog)
        self.dialogLayout.setObjectName(u"dialogLayout")
        self.parameterSplitter = QSplitter(ParameterOptionsDialog)
@@ -76,20 +77,82 @@ class Ui_ParameterOptionsDialog(object):

        self.parameterDetailsForm.setWidget(1, QFormLayout.ItemRole.LabelRole, self.typeLabel)

-        self.typeEdit = QLineEdit(self.parameterDetailsPanel)
-        self.typeEdit.setObjectName(u"typeEdit")
+        self.typeCombo = QComboBox(self.parameterDetailsPanel)
+        self.typeCombo.addItem("")
+        self.typeCombo.addItem("")
+        self.typeCombo.addItem("")
+        self.typeCombo.addItem("")
+        self.typeCombo.setObjectName(u"typeCombo")
+        self.typeCombo.setEditable(True)

-        self.parameterDetailsForm.setWidget(1, QFormLayout.ItemRole.FieldRole, self.typeEdit)
+        self.parameterDetailsForm.setWidget(1, QFormLayout.ItemRole.FieldRole, self.typeCombo)
+
+        self.rowsLabel = QLabel(self.parameterDetailsPanel)
+        self.rowsLabel.setObjectName(u"rowsLabel")
+
+        self.parameterDetailsForm.setWidget(2, QFormLayout.ItemRole.LabelRole, self.rowsLabel)
+
+        self.rowsSpin = QSpinBox(self.parameterDetailsPanel)
+        self.rowsSpin.setObjectName(u"rowsSpin")
+        self.rowsSpin.setMinimum(1)
+        self.rowsSpin.setMaximum(9999)
+
+        self.parameterDetailsForm.setWidget(2, QFormLayout.ItemRole.FieldRole, self.rowsSpin)
+
+        self.columnsLabel = QLabel(self.parameterDetailsPanel)
+        self.columnsLabel.setObjectName(u"columnsLabel")
+
+        self.parameterDetailsForm.setWidget(3, QFormLayout.ItemRole.LabelRole, self.columnsLabel)
+
+        self.columnsSpin = QSpinBox(self.parameterDetailsPanel)
+        self.columnsSpin.setObjectName(u"columnsSpin")
+        self.columnsSpin.setMinimum(1)
+        self.columnsSpin.setMaximum(9999)
+
+        self.parameterDetailsForm.setWidget(3, QFormLayout.ItemRole.FieldRole, self.columnsSpin)

        self.valueLabel = QLabel(self.parameterDetailsPanel)
        self.valueLabel.setObjectName(u"valueLabel")

-        self.parameterDetailsForm.setWidget(2, QFormLayout.ItemRole.LabelRole, self.valueLabel)
+        self.parameterDetailsForm.setWidget(4, QFormLayout.ItemRole.LabelRole, self.valueLabel)

        self.valueEdit = QLineEdit(self.parameterDetailsPanel)
        self.valueEdit.setObjectName(u"valueEdit")

-        self.parameterDetailsForm.setWidget(2, QFormLayout.ItemRole.FieldRole, self.valueEdit)
+        self.parameterDetailsForm.setWidget(4, QFormLayout.ItemRole.FieldRole, self.valueEdit)
+
+        self.quantityLabel = QLabel(self.parameterDetailsPanel)
+        self.quantityLabel.setObjectName(u"quantityLabel")
+
+        self.parameterDetailsForm.setWidget(5, QFormLayout.ItemRole.LabelRole, self.quantityLabel)
+
+        self.quantityCombo = QComboBox(self.parameterDetailsPanel)
+        self.quantityCombo.setObjectName(u"quantityCombo")
+        self.quantityCombo.setEditable(True)
+
+        self.parameterDetailsForm.setWidget(5, QFormLayout.ItemRole.FieldRole, self.quantityCombo)
+
+        self.unitLabel = QLabel(self.parameterDetailsPanel)
+        self.unitLabel.setObjectName(u"unitLabel")
+
+        self.parameterDetailsForm.setWidget(6, QFormLayout.ItemRole.LabelRole, self.unitLabel)
+
+        self.unitCombo = QComboBox(self.parameterDetailsPanel)
+        self.unitCombo.setObjectName(u"unitCombo")
+        self.unitCombo.setEditable(True)
+
+        self.parameterDetailsForm.setWidget(6, QFormLayout.ItemRole.FieldRole, self.unitCombo)
+
+        self.descriptionLabel = QLabel(self.parameterDetailsPanel)
+        self.descriptionLabel.setObjectName(u"descriptionLabel")
+
+        self.parameterDetailsForm.setWidget(7, QFormLayout.ItemRole.LabelRole, self.descriptionLabel)
+
+        self.descriptionEdit = QPlainTextEdit(self.parameterDetailsPanel)
+        self.descriptionEdit.setObjectName(u"descriptionEdit")
+        self.descriptionEdit.setMaximumHeight(100)
+
+        self.parameterDetailsForm.setWidget(7, QFormLayout.ItemRole.FieldRole, self.descriptionEdit)

        self.parameterSplitter.addWidget(self.parameterDetailsPanel)

@@ -115,6 +178,16 @@ class Ui_ParameterOptionsDialog(object):
        self.removeParameterButton.setText(QCoreApplication.translate("ParameterOptionsDialog", u"Remove Parameter", None))
        self.nameLabel.setText(QCoreApplication.translate("ParameterOptionsDialog", u"Name:", None))
        self.typeLabel.setText(QCoreApplication.translate("ParameterOptionsDialog", u"Type:", None))
+        self.typeCombo.setItemText(0, QCoreApplication.translate("ParameterOptionsDialog", u"real", None))
+        self.typeCombo.setItemText(1, QCoreApplication.translate("ParameterOptionsDialog", u"integer", None))
+        self.typeCombo.setItemText(2, QCoreApplication.translate("ParameterOptionsDialog", u"boolean", None))
+        self.typeCombo.setItemText(3, QCoreApplication.translate("ParameterOptionsDialog", u"string", None))
+
+        self.rowsLabel.setText(QCoreApplication.translate("ParameterOptionsDialog", u"Rows:", None))
+        self.columnsLabel.setText(QCoreApplication.translate("ParameterOptionsDialog", u"Columns:", None))
        self.valueLabel.setText(QCoreApplication.translate("ParameterOptionsDialog", u"Value:", None))
+        self.quantityLabel.setText(QCoreApplication.translate("ParameterOptionsDialog", u"Quantity:", None))
+        self.unitLabel.setText(QCoreApplication.translate("ParameterOptionsDialog", u"Unit:", None))
+        self.descriptionLabel.setText(QCoreApplication.translate("ParameterOptionsDialog", u"Description:", None))
    # retranslateUi

--- a/BEdit/src/bedit/gui/generated/ui_port_options_dialog.py
+++ b/BEdit/src/bedit/gui/generated/ui_port_options_dialog.py
@@ -18,14 +18,14 @@ from PySide6.QtGui import (QBrush, QColor, QConicalGradient, QCursor,
 from PySide6.QtWidgets import (QAbstractButton, QApplication, QCheckBox, QComboBox,
    QDialog, QDialogButtonBox, QFormLayout, QHBoxLayout,
    QLabel, QLineEdit, QListWidget, QListWidgetItem,
-    QPushButton, QSizePolicy, QSplitter, QVBoxLayout,
-    QWidget)
+    QPlainTextEdit, QPushButton, QSizePolicy, QSpinBox,
+    QSplitter, QStackedWidget, QVBoxLayout, QWidget)

 class Ui_PortOptionsDialog(object):
    def setupUi(self, PortOptionsDialog):
        if not PortOptionsDialog.objectName():
            PortOptionsDialog.setObjectName(u"PortOptionsDialog")
-        PortOptionsDialog.resize(620, 380)
+        PortOptionsDialog.resize(760, 421)
        self.dialogLayout = QVBoxLayout(PortOptionsDialog)
        self.dialogLayout.setObjectName(u"dialogLayout")
        self.portSplitter = QSplitter(PortOptionsDialog)
@@ -61,6 +61,7 @@ class Ui_PortOptionsDialog(object):
        self.portDetailsPanel.setObjectName(u"portDetailsPanel")
        self.portDetailsForm = QFormLayout(self.portDetailsPanel)
        self.portDetailsForm.setObjectName(u"portDetailsForm")
+        self.portDetailsForm.setVerticalSpacing(3)
        self.portDetailsForm.setContentsMargins(0, 0, 0, 0)
        self.nameLabel = QLabel(self.portDetailsPanel)
        self.nameLabel.setObjectName(u"nameLabel")
@@ -91,6 +92,7 @@ class Ui_PortOptionsDialog(object):
        self.orientationCombo = QComboBox(self.portDetailsPanel)
        self.orientationCombo.addItem("")
        self.orientationCombo.addItem("")
+        self.orientationCombo.addItem("")
        self.orientationCombo.setObjectName(u"orientationCombo")

        self.portDetailsForm.setWidget(2, QFormLayout.ItemRole.FieldRole, self.orientationCombo)
@@ -104,7 +106,154 @@ class Ui_PortOptionsDialog(object):
        self.positionHintLabel.setObjectName(u"positionHintLabel")
        self.positionHintLabel.setWordWrap(True)

-        self.portDetailsForm.setWidget(4, QFormLayout.ItemRole.SpanningRole, self.positionHintLabel)
+        self.portDetailsForm.setWidget(5, QFormLayout.ItemRole.SpanningRole, self.positionHintLabel)
+
+        self.typeOptionsStack = QStackedWidget(self.portDetailsPanel)
+        self.typeOptionsStack.setObjectName(u"typeOptionsStack")
+        self.signalOptionsPage = QWidget()
+        self.signalOptionsPage.setObjectName(u"signalOptionsPage")
+        self.signalOptionsForm = QFormLayout(self.signalOptionsPage)
+        self.signalOptionsForm.setObjectName(u"signalOptionsForm")
+        self.valueTypeLabel = QLabel(self.signalOptionsPage)
+        self.valueTypeLabel.setObjectName(u"valueTypeLabel")
+
+        self.signalOptionsForm.setWidget(0, QFormLayout.ItemRole.LabelRole, self.valueTypeLabel)
+
+        self.valueTypeCombo = QComboBox(self.signalOptionsPage)
+        self.valueTypeCombo.addItem("")
+        self.valueTypeCombo.addItem("")
+        self.valueTypeCombo.addItem("")
+        self.valueTypeCombo.addItem("")
+        self.valueTypeCombo.setObjectName(u"valueTypeCombo")
+        self.valueTypeCombo.setEditable(True)
+
+        self.signalOptionsForm.setWidget(0, QFormLayout.ItemRole.FieldRole, self.valueTypeCombo)
+
+        self.quantityLabel = QLabel(self.signalOptionsPage)
+        self.quantityLabel.setObjectName(u"quantityLabel")
+
+        self.signalOptionsForm.setWidget(1, QFormLayout.ItemRole.LabelRole, self.quantityLabel)
+
+        self.quantityCombo = QComboBox(self.signalOptionsPage)
+        self.quantityCombo.setObjectName(u"quantityCombo")
+        self.quantityCombo.setEditable(True)
+
+        self.signalOptionsForm.setWidget(1, QFormLayout.ItemRole.FieldRole, self.quantityCombo)
+
+        self.unitCombo = QComboBox(self.signalOptionsPage)
+        self.unitCombo.setObjectName(u"unitCombo")
+        self.unitCombo.setEditable(True)
+
+        self.signalOptionsForm.setWidget(2, QFormLayout.ItemRole.FieldRole, self.unitCombo)
+
+        self.unitLabel = QLabel(self.signalOptionsPage)
+        self.unitLabel.setObjectName(u"unitLabel")
+
+        self.signalOptionsForm.setWidget(2, QFormLayout.ItemRole.LabelRole, self.unitLabel)
+
+        self.rowsColumnsLabel = QLabel(self.signalOptionsPage)
+        self.rowsColumnsLabel.setObjectName(u"rowsColumnsLabel")
+
+        self.signalOptionsForm.setWidget(3, QFormLayout.ItemRole.LabelRole, self.rowsColumnsLabel)
+
+        self.horizontalLayout = QHBoxLayout()
+        self.horizontalLayout.setObjectName(u"horizontalLayout")
+        self.rowsSpin = QSpinBox(self.signalOptionsPage)
+        self.rowsSpin.setObjectName(u"rowsSpin")
+        self.rowsSpin.setMinimum(1)
+        self.rowsSpin.setMaximum(9999)
+
+        self.horizontalLayout.addWidget(self.rowsSpin)
+
+        self.columnsSpin = QSpinBox(self.signalOptionsPage)
+        self.columnsSpin.setObjectName(u"columnsSpin")
+        self.columnsSpin.setMinimum(1)
+        self.columnsSpin.setMaximum(9999)
+
+        self.horizontalLayout.addWidget(self.columnsSpin)
+
+
+        self.signalOptionsForm.setLayout(3, QFormLayout.ItemRole.FieldRole, self.horizontalLayout)
+
+        self.descriptionLabel = QLabel(self.signalOptionsPage)
+        self.descriptionLabel.setObjectName(u"descriptionLabel")
+
+        self.signalOptionsForm.setWidget(4, QFormLayout.ItemRole.LabelRole, self.descriptionLabel)
+
+        self.descriptionEdit = QPlainTextEdit(self.signalOptionsPage)
+        self.descriptionEdit.setObjectName(u"descriptionEdit")
+
+        self.signalOptionsForm.setWidget(4, QFormLayout.ItemRole.FieldRole, self.descriptionEdit)
+
+        self.typeOptionsStack.addWidget(self.signalOptionsPage)
+        self.powerOptionsPage = QWidget()
+        self.powerOptionsPage.setObjectName(u"powerOptionsPage")
+        self.powerOptionsForm = QFormLayout(self.powerOptionsPage)
+        self.powerOptionsForm.setObjectName(u"powerOptionsForm")
+        self.domainLabel = QLabel(self.powerOptionsPage)
+        self.domainLabel.setObjectName(u"domainLabel")
+
+        self.powerOptionsForm.setWidget(0, QFormLayout.ItemRole.LabelRole, self.domainLabel)
+
+        self.domainCombo = QComboBox(self.powerOptionsPage)
+        self.domainCombo.setObjectName(u"domainCombo")
+
+        self.powerOptionsForm.setWidget(0, QFormLayout.ItemRole.FieldRole, self.domainCombo)
+
+        self.effortLabel = QLabel(self.powerOptionsPage)
+        self.effortLabel.setObjectName(u"effortLabel")
+
+        self.powerOptionsForm.setWidget(1, QFormLayout.ItemRole.LabelRole, self.effortLabel)
+
+        self.effortValueLabel = QLabel(self.powerOptionsPage)
+        self.effortValueLabel.setObjectName(u"effortValueLabel")
+
+        self.powerOptionsForm.setWidget(1, QFormLayout.ItemRole.FieldRole, self.effortValueLabel)
+
+        self.flowLabel = QLabel(self.powerOptionsPage)
+        self.flowLabel.setObjectName(u"flowLabel")
+
+        self.powerOptionsForm.setWidget(2, QFormLayout.ItemRole.LabelRole, self.flowLabel)
+
+        self.flowValueLabel = QLabel(self.powerOptionsPage)
+        self.flowValueLabel.setObjectName(u"flowValueLabel")
+
+        self.powerOptionsForm.setWidget(2, QFormLayout.ItemRole.FieldRole, self.flowValueLabel)
+
+        self.causalityLabel = QLabel(self.powerOptionsPage)
+        self.causalityLabel.setObjectName(u"causalityLabel")
+
+        self.powerOptionsForm.setWidget(3, QFormLayout.ItemRole.LabelRole, self.causalityLabel)
+
+        self.causalityCombo = QComboBox(self.powerOptionsPage)
+        self.causalityCombo.setObjectName(u"causalityCombo")
+
+        self.powerOptionsForm.setWidget(3, QFormLayout.ItemRole.FieldRole, self.causalityCombo)
+
+        self.powerDescriptionLabel = QLabel(self.powerOptionsPage)
+        self.powerDescriptionLabel.setObjectName(u"powerDescriptionLabel")
+
+        self.powerOptionsForm.setWidget(4, QFormLayout.ItemRole.LabelRole, self.powerDescriptionLabel)
+
+        self.powerDescriptionEdit = QPlainTextEdit(self.powerOptionsPage)
+        self.powerDescriptionEdit.setObjectName(u"powerDescriptionEdit")
+
+        self.powerOptionsForm.setWidget(4, QFormLayout.ItemRole.FieldRole, self.powerDescriptionEdit)
+
+        self.typeOptionsStack.addWidget(self.powerOptionsPage)
+        self.unsupportedTypePage = QWidget()
+        self.unsupportedTypePage.setObjectName(u"unsupportedTypePage")
+        self.unsupportedTypeLayout = QVBoxLayout(self.unsupportedTypePage)
+        self.unsupportedTypeLayout.setObjectName(u"unsupportedTypeLayout")
+        self.unsupportedTypeLabel = QLabel(self.unsupportedTypePage)
+        self.unsupportedTypeLabel.setObjectName(u"unsupportedTypeLabel")
+        self.unsupportedTypeLabel.setWordWrap(True)
+
+        self.unsupportedTypeLayout.addWidget(self.unsupportedTypeLabel)
+
+        self.typeOptionsStack.addWidget(self.unsupportedTypePage)
+
+        self.portDetailsForm.setWidget(4, QFormLayout.ItemRole.SpanningRole, self.typeOptionsStack)

        self.portSplitter.addWidget(self.portDetailsPanel)

@@ -129,14 +278,33 @@ class Ui_PortOptionsDialog(object):
        self.addPortButton.setText(QCoreApplication.translate("PortOptionsDialog", u"Add Port", None))
        self.removePortButton.setText(QCoreApplication.translate("PortOptionsDialog", u"Remove Port", None))
        self.nameLabel.setText(QCoreApplication.translate("PortOptionsDialog", u"Name:", None))
-        self.typeLabel.setText(QCoreApplication.translate("PortOptionsDialog", u"Type:", None))
+        self.typeLabel.setText(QCoreApplication.translate("PortOptionsDialog", u"Port type:", None))
        self.typeCombo.setItemText(0, QCoreApplication.translate("PortOptionsDialog", u"Signal", None))

        self.orientationLabel.setText(QCoreApplication.translate("PortOptionsDialog", u"Orientation:", None))
        self.orientationCombo.setItemText(0, QCoreApplication.translate("PortOptionsDialog", u"Input", None))
        self.orientationCombo.setItemText(1, QCoreApplication.translate("PortOptionsDialog", u"Output", None))
+        self.orientationCombo.setItemText(2, QCoreApplication.translate("PortOptionsDialog", u"Indifferent", None))

        self.multipleConnectionsCheckBox.setText(QCoreApplication.translate("PortOptionsDialog", u"Allow multiple connections", None))
        self.positionHintLabel.setText(QCoreApplication.translate("PortOptionsDialog", u"New ports start at (0, 0) in the icon editor.", None))
+        self.valueTypeLabel.setText(QCoreApplication.translate("PortOptionsDialog", u"Type:", None))
+        self.valueTypeCombo.setItemText(0, QCoreApplication.translate("PortOptionsDialog", u"real", None))
+        self.valueTypeCombo.setItemText(1, QCoreApplication.translate("PortOptionsDialog", u"integer", None))
+        self.valueTypeCombo.setItemText(2, QCoreApplication.translate("PortOptionsDialog", u"boolean", None))
+        self.valueTypeCombo.setItemText(3, QCoreApplication.translate("PortOptionsDialog", u"string", None))
+
+        self.quantityLabel.setText(QCoreApplication.translate("PortOptionsDialog", u"Quantity:", None))
+        self.unitLabel.setText(QCoreApplication.translate("PortOptionsDialog", u"Unit:", None))
+        self.rowsColumnsLabel.setText(QCoreApplication.translate("PortOptionsDialog", u"Matrix size:", None))
+        self.descriptionLabel.setText(QCoreApplication.translate("PortOptionsDialog", u"Description:", None))
+        self.domainLabel.setText(QCoreApplication.translate("PortOptionsDialog", u"Domain:", None))
+        self.effortLabel.setText(QCoreApplication.translate("PortOptionsDialog", u"Effort:", None))
+        self.effortValueLabel.setText(QCoreApplication.translate("PortOptionsDialog", u"p.e", None))
+        self.flowLabel.setText(QCoreApplication.translate("PortOptionsDialog", u"Flow:", None))
+        self.flowValueLabel.setText(QCoreApplication.translate("PortOptionsDialog", u"p.f", None))
+        self.causalityLabel.setText(QCoreApplication.translate("PortOptionsDialog", u"Causality:", None))
+        self.powerDescriptionLabel.setText(QCoreApplication.translate("PortOptionsDialog", u"Description:", None))
+        self.unsupportedTypeLabel.setText(QCoreApplication.translate("PortOptionsDialog", u"This port type does not have an options editor yet.", None))
    # retranslateUi

--- a/BEdit/src/bedit/gui/generated/ui_settings_dialog.py
+++ b/BEdit/src/bedit/gui/generated/ui_settings_dialog.py
@@ -15,12 +15,12 @@ from PySide6.QtGui import (QBrush, QColor, QConicalGradient, QCursor,
    QFont, QFontDatabase, QGradient, QIcon,
    QImage, QKeySequence, QLinearGradient, QPainter,
    QPalette, QPixmap, QRadialGradient, QTransform)
-from PySide6.QtWidgets import (QAbstractButton, QAbstractItemView, QApplication, QDialog,
-    QDialogButtonBox, QFormLayout, QGroupBox, QHBoxLayout,
-    QHeaderView, QLabel, QLineEdit, QListWidget,
-    QListWidgetItem, QPushButton, QSizePolicy, QSpacerItem,
-    QSpinBox, QTabWidget, QTableWidget, QTableWidgetItem,
-    QVBoxLayout, QWidget)
+from PySide6.QtWidgets import (QAbstractButton, QAbstractItemView, QApplication, QCheckBox,
+    QDialog, QDialogButtonBox, QFormLayout, QGroupBox,
+    QHBoxLayout, QHeaderView, QLabel, QLineEdit,
+    QListWidget, QListWidgetItem, QPushButton, QSizePolicy,
+    QSpacerItem, QSpinBox, QTabWidget, QTableWidget,
+    QTableWidgetItem, QVBoxLayout, QWidget)

 class Ui_SettingsDialog(object):
    def setupUi(self, SettingsDialog):
@@ -104,6 +104,34 @@ class Ui_SettingsDialog(object):
        self.generalLayout.addItem(self.generalSpacer)

        self.settingsTabs.addTab(self.generalTab, "")
+        self.bondGraphTab = QWidget()
+        self.bondGraphTab.setObjectName(u"bondGraphTab")
+        self.bondGraphLayout = QVBoxLayout(self.bondGraphTab)
+        self.bondGraphLayout.setObjectName(u"bondGraphLayout")
+        self.causalityGroupBox = QGroupBox(self.bondGraphTab)
+        self.causalityGroupBox.setObjectName(u"causalityGroupBox")
+        self.causalityLayout = QVBoxLayout(self.causalityGroupBox)
+        self.causalityLayout.setObjectName(u"causalityLayout")
+        self.automaticCausalityCheckBox = QCheckBox(self.causalityGroupBox)
+        self.automaticCausalityCheckBox.setObjectName(u"automaticCausalityCheckBox")
+        self.automaticCausalityCheckBox.setChecked(True)
+
+        self.causalityLayout.addWidget(self.automaticCausalityCheckBox)
+
+        self.automaticCausalityHintLabel = QLabel(self.causalityGroupBox)
+        self.automaticCausalityHintLabel.setObjectName(u"automaticCausalityHintLabel")
+        self.automaticCausalityHintLabel.setWordWrap(True)
+
+        self.causalityLayout.addWidget(self.automaticCausalityHintLabel)
+
+
+        self.bondGraphLayout.addWidget(self.causalityGroupBox)
+
+        self.bondGraphSpacer = QSpacerItem(20, 40, QSizePolicy.Policy.Minimum, QSizePolicy.Policy.Expanding)
+
+        self.bondGraphLayout.addItem(self.bondGraphSpacer)
+
+        self.settingsTabs.addTab(self.bondGraphTab, "")
        self.simulationTab = QWidget()
        self.simulationTab.setObjectName(u"simulationTab")
        self.simulationTabLayout = QVBoxLayout(self.simulationTab)
@@ -247,6 +275,10 @@ class Ui_SettingsDialog(object):
        self.iconGridLabel.setText(QCoreApplication.translate("SettingsDialog", u"Icon grid size:", None))
        self.iconGridSpinBox.setSuffix(QCoreApplication.translate("SettingsDialog", u" units", None))
        self.settingsTabs.setTabText(self.settingsTabs.indexOf(self.generalTab), QCoreApplication.translate("SettingsDialog", u"General", None))
+        self.causalityGroupBox.setTitle(QCoreApplication.translate("SettingsDialog", u"Causality", None))
+        self.automaticCausalityCheckBox.setText(QCoreApplication.translate("SettingsDialog", u"Infer causality when connections are added or removed", None))
+        self.automaticCausalityHintLabel.setText(QCoreApplication.translate("SettingsDialog", u"When disabled, displayed causalities are updated only when compiling, exporting, or running the model.", None))
+        self.settingsTabs.setTabText(self.settingsTabs.indexOf(self.bondGraphTab), QCoreApplication.translate("SettingsDialog", u"Bond graph", None))
        self.openModelicaGroupBox.setTitle(QCoreApplication.translate("SettingsDialog", u"OpenModelica", None))
        self.openModelicaPathLabel.setText(QCoreApplication.translate("SettingsDialog", u"OpenModelica executable:", None))
        self.openModelicaPathEdit.setPlaceholderText(QCoreApplication.translate("SettingsDialog", u"Leave empty to find omc on PATH", None))
--- a/BEdit/src/bedit/gui/generated/ui_simulation_window.py
+++ b/BEdit/src/bedit/gui/generated/ui_simulation_window.py
@@ -16,10 +16,11 @@ from PySide6.QtGui import (QAction, QBrush, QColor, QConicalGradient,
    QIcon, QImage, QKeySequence, QLinearGradient,
    QPainter, QPalette, QPixmap, QRadialGradient,
    QTransform)
-from PySide6.QtWidgets import (QApplication, QDockWidget, QHBoxLayout, QLabel,
-    QListWidget, QListWidgetItem, QMainWindow, QMenu,
-    QMenuBar, QProgressBar, QSizePolicy, QToolBar,
-    QVBoxLayout, QWidget)
+from PySide6.QtWidgets import (QAbstractItemView, QApplication, QDockWidget, QHBoxLayout,
+    QHeaderView, QLabel, QListWidget, QListWidgetItem,
+    QMainWindow, QMenu, QMenuBar, QProgressBar,
+    QSizePolicy, QTabWidget, QToolBar, QTreeWidget,
+    QTreeWidgetItem, QVBoxLayout, QWidget)
 from . import resources_rc

 class Ui_SimulationWindow(object):
@@ -60,15 +61,26 @@ class Ui_SimulationWindow(object):
        self.actionToggleResults.setObjectName(u"actionToggleResults")
        self.actionToggleResults.setCheckable(True)
        self.actionToggleResults.setChecked(True)
+        self.actionAddGraph = QAction(SimulationWindow)
+        self.actionAddGraph.setObjectName(u"actionAddGraph")
+        icon5 = QIcon()
+        icon5.addFile(u":/icons/icons/list-add.png", QSize(), QIcon.Mode.Normal, QIcon.State.Off)
+        self.actionAddGraph.setIcon(icon5)
+        self.actionRemoveGraph = QAction(SimulationWindow)
+        self.actionRemoveGraph.setObjectName(u"actionRemoveGraph")
+        icon6 = QIcon()
+        icon6.addFile(u":/icons/icons/list-remove.png", QSize(), QIcon.Mode.Normal, QIcon.State.Off)
+        self.actionRemoveGraph.setIcon(icon6)
        self.centralWidget = QWidget(SimulationWindow)
        self.centralWidget.setObjectName(u"centralWidget")
        self.resultsLayout = QVBoxLayout(self.centralWidget)
        self.resultsLayout.setObjectName(u"resultsLayout")
-        self.resultsPlaceholder = QLabel(self.centralWidget)
-        self.resultsPlaceholder.setObjectName(u"resultsPlaceholder")
-        self.resultsPlaceholder.setAlignment(Qt.AlignmentFlag.AlignCenter)
+        self.graphTabs = QTabWidget(self.centralWidget)
+        self.graphTabs.setObjectName(u"graphTabs")
+        self.graphTabs.setTabsClosable(False)
+        self.graphTabs.setMovable(True)

-        self.resultsLayout.addWidget(self.resultsPlaceholder)
+        self.resultsLayout.addWidget(self.graphTabs)

        SimulationWindow.setCentralWidget(self.centralWidget)
        self.menuBar = QMenuBar(SimulationWindow)
@@ -84,7 +96,13 @@ class Ui_SimulationWindow(object):
        self.menuToolbars.setObjectName(u"menuToolbars")
        self.menuHelp = QMenu(self.menuBar)
        self.menuHelp.setObjectName(u"menuHelp")
+        self.menuGraph = QMenu(self.menuBar)
+        self.menuGraph.setObjectName(u"menuGraph")
        SimulationWindow.setMenuBar(self.menuBar)
+        self.workspaceToolbar = QToolBar(SimulationWindow)
+        self.workspaceToolbar.setObjectName(u"workspaceToolbar")
+        self.workspaceToolbar.setToolButtonStyle(Qt.ToolButtonStyle.ToolButtonIconOnly)
+        SimulationWindow.addToolBar(Qt.ToolBarArea.TopToolBarArea, self.workspaceToolbar)
        self.fileToolbar = QToolBar(SimulationWindow)
        self.fileToolbar.setObjectName(u"fileToolbar")
        self.fileToolbar.setToolButtonStyle(Qt.ToolButtonStyle.ToolButtonIconOnly)
@@ -130,9 +148,26 @@ class Ui_SimulationWindow(object):

        self.logDock.setWidget(self.logDockContents)
        SimulationWindow.addDockWidget(Qt.DockWidgetArea.BottomDockWidgetArea, self.logDock)
+        self.signalsDock = QDockWidget(SimulationWindow)
+        self.signalsDock.setObjectName(u"signalsDock")
+        self.signalsDockContents = QWidget()
+        self.signalsDockContents.setObjectName(u"signalsDockContents")
+        self.signalsLayout = QVBoxLayout(self.signalsDockContents)
+        self.signalsLayout.setObjectName(u"signalsLayout")
+        self.signalsTree = QTreeWidget(self.signalsDockContents)
+        self.signalsTree.setObjectName(u"signalsTree")
+        self.signalsTree.setContextMenuPolicy(Qt.ContextMenuPolicy.CustomContextMenu)
+        self.signalsTree.setSelectionMode(QAbstractItemView.SelectionMode.ExtendedSelection)
+        self.signalsTree.setHeaderHidden(True)
+
+        self.signalsLayout.addWidget(self.signalsTree)
+
+        self.signalsDock.setWidget(self.signalsDockContents)
+        SimulationWindow.addDockWidget(Qt.DockWidgetArea.RightDockWidgetArea, self.signalsDock)

        self.menuBar.addAction(self.menuFile.menuAction())
        self.menuBar.addAction(self.menuView.menuAction())
+        self.menuBar.addAction(self.menuGraph.menuAction())
        self.menuBar.addAction(self.menuHelp.menuAction())
        self.menuFile.addAction(self.actionOpen)
        self.menuFile.addAction(self.actionSave)
@@ -145,10 +180,14 @@ class Ui_SimulationWindow(object):
        self.menuView.addAction(self.menuToolbars.menuAction())
        self.menuHelp.addAction(self.actionAbout)
        self.menuHelp.addAction(self.actionAboutQt)
+        self.menuGraph.addAction(self.actionAddGraph)
+        self.menuGraph.addAction(self.actionRemoveGraph)
+        self.workspaceToolbar.addAction(self.actionAddGraph)
+        self.workspaceToolbar.addAction(self.actionRemoveGraph)
+        self.fileToolbar.addAction(self.actionClear)
        self.fileToolbar.addAction(self.actionOpen)
        self.fileToolbar.addAction(self.actionSave)
        self.fileToolbar.addAction(self.actionSaveAs)
-        self.fileToolbar.addAction(self.actionClear)

        self.retranslateUi(SimulationWindow)

@@ -177,17 +216,29 @@ class Ui_SimulationWindow(object):
        self.actionAbout.setText(QCoreApplication.translate("SimulationWindow", u"&About Simulation Window", None))
        self.actionAboutQt.setText(QCoreApplication.translate("SimulationWindow", u"About &Qt", None))
        self.actionToggleResults.setText(QCoreApplication.translate("SimulationWindow", u"Results", None))
-        self.resultsPlaceholder.setText(QCoreApplication.translate("SimulationWindow", u"Simulation graphs and result controls can be added here.", None))
+        self.actionAddGraph.setText(QCoreApplication.translate("SimulationWindow", u"Add Graph", None))
+#if QT_CONFIG(statustip)
+        self.actionAddGraph.setStatusTip(QCoreApplication.translate("SimulationWindow", u"Add a graph workspace tab", None))
+#endif // QT_CONFIG(statustip)
+        self.actionRemoveGraph.setText(QCoreApplication.translate("SimulationWindow", u"Remove Current Graph", None))
+#if QT_CONFIG(statustip)
+        self.actionRemoveGraph.setStatusTip(QCoreApplication.translate("SimulationWindow", u"Remove the current graph workspace tab", None))
+#endif // QT_CONFIG(statustip)
        self.menuFile.setTitle(QCoreApplication.translate("SimulationWindow", u"&File", None))
        self.menuView.setTitle(QCoreApplication.translate("SimulationWindow", u"&View", None))
        self.menuPanels.setTitle(QCoreApplication.translate("SimulationWindow", u"&Panels", None))
        self.menuToolbars.setTitle(QCoreApplication.translate("SimulationWindow", u"&Toolbars", None))
        self.menuHelp.setTitle(QCoreApplication.translate("SimulationWindow", u"&Help", None))
+        self.menuGraph.setTitle(QCoreApplication.translate("SimulationWindow", u"&Graph", None))
+        self.workspaceToolbar.setWindowTitle(QCoreApplication.translate("SimulationWindow", u"Workspace", None))
        self.fileToolbar.setWindowTitle(QCoreApplication.translate("SimulationWindow", u"File", None))
        self.statusDock.setWindowTitle(QCoreApplication.translate("SimulationWindow", u"Status", None))
        self.timeLabel.setText(QCoreApplication.translate("SimulationWindow", u"Time: 0 s", None))
        self.progressBar.setFormat(QCoreApplication.translate("SimulationWindow", u"%p%", None))
        self.statusLabel.setText(QCoreApplication.translate("SimulationWindow", u"No simulation has been run yet.", None))
        self.logDock.setWindowTitle(QCoreApplication.translate("SimulationWindow", u"Log", None))
+        self.signalsDock.setWindowTitle(QCoreApplication.translate("SimulationWindow", u"Signals", None))
+        ___qtreewidgetitem = self.signalsTree.headerItem()
+        ___qtreewidgetitem.setText(0, QCoreApplication.translate("SimulationWindow", u"Signal", None))
    # retranslateUi

--- a/BEdit/src/bedit/gui/generated/ui_text_definition_editor.py
+++ b/BEdit/src/bedit/gui/generated/ui_text_definition_editor.py
@@ -15,11 +15,11 @@ from PySide6.QtGui import (QBrush, QColor, QConicalGradient, QCursor,
    QFont, QFontDatabase, QGradient, QIcon,
    QImage, QKeySequence, QLinearGradient, QPainter,
    QPalette, QPixmap, QRadialGradient, QTransform)
-from PySide6.QtWidgets import (QAbstractItemView, QApplication, QGroupBox, QHBoxLayout,
-    QHeaderView, QPushButton, QSizePolicy, QSpacerItem,
-    QSplitter, QTableWidget, QTableWidgetItem, QVBoxLayout,
-    QWidget)
+from PySide6.QtWidgets import (QApplication, QGroupBox, QHBoxLayout, QSizePolicy,
+    QSplitter, QVBoxLayout, QWidget)

+from bedit.gui.dialogs.parameter_options import ParameterEditor
+from bedit.gui.dialogs.port_options import PortEditor
 from bedit.gui.editors.openmodelica import OpenModelicaEditor

 class Ui_TextDefinitionEditor(object):
@@ -34,7 +34,31 @@ class Ui_TextDefinitionEditor(object):
        self.columnSplitter.setObjectName(u"columnSplitter")
        self.columnSplitter.setOrientation(Qt.Orientation.Horizontal)
        self.columnSplitter.setChildrenCollapsible(False)
-        self.equationsGroup = QGroupBox(self.columnSplitter)
+        self.sourceSplitter = QSplitter(self.columnSplitter)
+        self.sourceSplitter.setObjectName(u"sourceSplitter")
+        self.sourceSplitter.setOrientation(Qt.Orientation.Vertical)
+        self.sourceSplitter.setChildrenCollapsible(False)
+        self.declarationsGroup = QGroupBox(self.sourceSplitter)
+        self.declarationsGroup.setObjectName(u"declarationsGroup")
+        self.declarationsLayout = QVBoxLayout(self.declarationsGroup)
+        self.declarationsLayout.setObjectName(u"declarationsLayout")
+        self.declarationsEdit = OpenModelicaEditor(self.declarationsGroup)
+        self.declarationsEdit.setObjectName(u"declarationsEdit")
+
+        self.declarationsLayout.addWidget(self.declarationsEdit)
+
+        self.sourceSplitter.addWidget(self.declarationsGroup)
+        self.initialEquationsGroup = QGroupBox(self.sourceSplitter)
+        self.initialEquationsGroup.setObjectName(u"initialEquationsGroup")
+        self.initialEquationsLayout = QVBoxLayout(self.initialEquationsGroup)
+        self.initialEquationsLayout.setObjectName(u"initialEquationsLayout")
+        self.initialEquationsEdit = OpenModelicaEditor(self.initialEquationsGroup)
+        self.initialEquationsEdit.setObjectName(u"initialEquationsEdit")
+
+        self.initialEquationsLayout.addWidget(self.initialEquationsEdit)
+
+        self.sourceSplitter.addWidget(self.initialEquationsGroup)
+        self.equationsGroup = QGroupBox(self.sourceSplitter)
        self.equationsGroup.setObjectName(u"equationsGroup")
        self.equationsLayout = QVBoxLayout(self.equationsGroup)
        self.equationsLayout.setObjectName(u"equationsLayout")
@@ -43,7 +67,8 @@ class Ui_TextDefinitionEditor(object):

        self.equationsLayout.addWidget(self.equationsEdit)

-        self.columnSplitter.addWidget(self.equationsGroup)
+        self.sourceSplitter.addWidget(self.equationsGroup)
+        self.columnSplitter.addWidget(self.sourceSplitter)
        self.definitionSplitter = QSplitter(self.columnSplitter)
        self.definitionSplitter.setObjectName(u"definitionSplitter")
        self.definitionSplitter.setOrientation(Qt.Orientation.Vertical)
@@ -52,82 +77,20 @@ class Ui_TextDefinitionEditor(object):
        self.portsGroup.setObjectName(u"portsGroup")
        self.portsLayout = QVBoxLayout(self.portsGroup)
        self.portsLayout.setObjectName(u"portsLayout")
-        self.portsTable = QTableWidget(self.portsGroup)
-        if (self.portsTable.columnCount() < 4):
-            self.portsTable.setColumnCount(4)
-        __qtablewidgetitem = QTableWidgetItem()
-        self.portsTable.setHorizontalHeaderItem(0, __qtablewidgetitem)
-        __qtablewidgetitem1 = QTableWidgetItem()
-        self.portsTable.setHorizontalHeaderItem(1, __qtablewidgetitem1)
-        __qtablewidgetitem2 = QTableWidgetItem()
-        self.portsTable.setHorizontalHeaderItem(2, __qtablewidgetitem2)
-        __qtablewidgetitem3 = QTableWidgetItem()
-        self.portsTable.setHorizontalHeaderItem(3, __qtablewidgetitem3)
-        self.portsTable.setObjectName(u"portsTable")
-        self.portsTable.setSelectionBehavior(QAbstractItemView.SelectionBehavior.SelectRows)
-        self.portsTable.setSelectionMode(QAbstractItemView.SelectionMode.SingleSelection)
-        self.portsTable.setColumnCount(4)
+        self.portEditor = PortEditor(self.portsGroup)
+        self.portEditor.setObjectName(u"portEditor")

-        self.portsLayout.addWidget(self.portsTable)
-
-        self.portButtonsLayout = QHBoxLayout()
-        self.portButtonsLayout.setObjectName(u"portButtonsLayout")
-        self.addPortButton = QPushButton(self.portsGroup)
-        self.addPortButton.setObjectName(u"addPortButton")
-
-        self.portButtonsLayout.addWidget(self.addPortButton)
-
-        self.removePortButton = QPushButton(self.portsGroup)
-        self.removePortButton.setObjectName(u"removePortButton")
-
-        self.portButtonsLayout.addWidget(self.removePortButton)
-
-        self.portButtonSpacer = QSpacerItem(40, 20, QSizePolicy.Policy.Expanding, QSizePolicy.Policy.Minimum)
-
-        self.portButtonsLayout.addItem(self.portButtonSpacer)
-
-
-        self.portsLayout.addLayout(self.portButtonsLayout)
+        self.portsLayout.addWidget(self.portEditor)

        self.definitionSplitter.addWidget(self.portsGroup)
        self.parametersGroup = QGroupBox(self.definitionSplitter)
        self.parametersGroup.setObjectName(u"parametersGroup")
        self.parametersLayout = QVBoxLayout(self.parametersGroup)
        self.parametersLayout.setObjectName(u"parametersLayout")
-        self.parametersTable = QTableWidget(self.parametersGroup)
-        if (self.parametersTable.columnCount() < 3):
-            self.parametersTable.setColumnCount(3)
-        __qtablewidgetitem4 = QTableWidgetItem()
-        self.parametersTable.setHorizontalHeaderItem(0, __qtablewidgetitem4)
-        __qtablewidgetitem5 = QTableWidgetItem()
-        self.parametersTable.setHorizontalHeaderItem(1, __qtablewidgetitem5)
-        __qtablewidgetitem6 = QTableWidgetItem()
-        self.parametersTable.setHorizontalHeaderItem(2, __qtablewidgetitem6)
-        self.parametersTable.setObjectName(u"parametersTable")
-        self.parametersTable.setSelectionBehavior(QAbstractItemView.SelectionBehavior.SelectRows)
-        self.parametersTable.setSelectionMode(QAbstractItemView.SelectionMode.SingleSelection)
-        self.parametersTable.setColumnCount(3)
+        self.parameterEditor = ParameterEditor(self.parametersGroup)
+        self.parameterEditor.setObjectName(u"parameterEditor")

-        self.parametersLayout.addWidget(self.parametersTable)
-
-        self.parameterButtonsLayout = QHBoxLayout()
-        self.parameterButtonsLayout.setObjectName(u"parameterButtonsLayout")
-        self.addParameterButton = QPushButton(self.parametersGroup)
-        self.addParameterButton.setObjectName(u"addParameterButton")
-
-        self.parameterButtonsLayout.addWidget(self.addParameterButton)
-
-        self.removeParameterButton = QPushButton(self.parametersGroup)
-        self.removeParameterButton.setObjectName(u"removeParameterButton")
-
-        self.parameterButtonsLayout.addWidget(self.removeParameterButton)
-
-        self.parameterButtonSpacer = QSpacerItem(40, 20, QSizePolicy.Policy.Expanding, QSizePolicy.Policy.Minimum)
-
-        self.parameterButtonsLayout.addItem(self.parameterButtonSpacer)
-
-
-        self.parametersLayout.addLayout(self.parameterButtonsLayout)
+        self.parametersLayout.addWidget(self.parameterEditor)

        self.definitionSplitter.addWidget(self.parametersGroup)
        self.columnSplitter.addWidget(self.definitionSplitter)
@@ -141,27 +104,11 @@ class Ui_TextDefinitionEditor(object):
    # setupUi

    def retranslateUi(self, TextDefinitionEditor):
+        self.declarationsGroup.setTitle(QCoreApplication.translate("TextDefinitionEditor", u"Declarations", None))
+        self.initialEquationsGroup.setTitle(QCoreApplication.translate("TextDefinitionEditor", u"Initial Equations", None))
        self.equationsGroup.setTitle(QCoreApplication.translate("TextDefinitionEditor", u"Equations", None))
        self.portsGroup.setTitle(QCoreApplication.translate("TextDefinitionEditor", u"Ports", None))
-        ___qtablewidgetitem = self.portsTable.horizontalHeaderItem(0)
-        ___qtablewidgetitem.setText(QCoreApplication.translate("TextDefinitionEditor", u"Name", None))
-        ___qtablewidgetitem1 = self.portsTable.horizontalHeaderItem(1)
-        ___qtablewidgetitem1.setText(QCoreApplication.translate("TextDefinitionEditor", u"Type", None))
-        ___qtablewidgetitem2 = self.portsTable.horizontalHeaderItem(2)
-        ___qtablewidgetitem2.setText(QCoreApplication.translate("TextDefinitionEditor", u"Orientation", None))
-        ___qtablewidgetitem3 = self.portsTable.horizontalHeaderItem(3)
-        ___qtablewidgetitem3.setText(QCoreApplication.translate("TextDefinitionEditor", u"Multiple", None))
-        self.addPortButton.setText(QCoreApplication.translate("TextDefinitionEditor", u"Add Port", None))
-        self.removePortButton.setText(QCoreApplication.translate("TextDefinitionEditor", u"Remove Port", None))
        self.parametersGroup.setTitle(QCoreApplication.translate("TextDefinitionEditor", u"Parameters", None))
-        ___qtablewidgetitem4 = self.parametersTable.horizontalHeaderItem(0)
-        ___qtablewidgetitem4.setText(QCoreApplication.translate("TextDefinitionEditor", u"Name", None))
-        ___qtablewidgetitem5 = self.parametersTable.horizontalHeaderItem(1)
-        ___qtablewidgetitem5.setText(QCoreApplication.translate("TextDefinitionEditor", u"Type", None))
-        ___qtablewidgetitem6 = self.parametersTable.horizontalHeaderItem(2)
-        ___qtablewidgetitem6.setText(QCoreApplication.translate("TextDefinitionEditor", u"Value", None))
-        self.addParameterButton.setText(QCoreApplication.translate("TextDefinitionEditor", u"Add Parameter", None))
-        self.removeParameterButton.setText(QCoreApplication.translate("TextDefinitionEditor", u"Remove Parameter", None))
        pass
    # retranslateUi

--- a/BEdit/src/bedit/gui/graphics/connection_styles.py
+++ b/BEdit/src/bedit/gui/graphics/connection_styles.py
@@ -1,8 +1,12 @@
 from dataclasses import dataclass
+from typing import Literal

 from PySide6.QtCore import Qt


+ArrowStyle = Literal["open", "half", "filled"]
+
+
@dataclass(frozen=True)
 class ConnectionStyle:
    color: str = "#285f9e"
@@ -13,11 +17,17 @@ class ConnectionStyle:
    arrow_at_source: bool = False
    arrow_at_target: bool = True
    arrow_size: float = 10.0
+    arrow_style: ArrowStyle = "filled"
+
+    def __post_init__(self) -> None:
+        if self.arrow_style not in {"open", "half", "filled"}:
+            raise ValueError(f"Unknown connection arrow style: {self.arrow_style}")


 # This is the intentional code-level styling point for every port/connection type.
 CONNECTION_STYLES: dict[str, ConnectionStyle] = {
    "signal": ConnectionStyle(),
+    "power": ConnectionStyle(width=3.0, arrow_style="half", color="#000000", arrow_size=20.0),
 }


--- a/BEdit/src/bedit/gui/graphics/icon_editor.py
+++ b/BEdit/src/bedit/gui/graphics/icon_editor.py
@@ -1,6 +1,6 @@
 from copy import deepcopy

-from PySide6.QtCore import QPointF, QRectF, QSizeF, Qt
+from PySide6.QtCore import QPointF, QRectF, QSizeF, Qt, QTimer
 from PySide6.QtGui import QColor, QPainter, QPainterPath, QPen, QPolygonF
 from PySide6.QtWidgets import (
    QColorDialog,
@@ -458,8 +458,7 @@ class IconEditorDialog(QDialog):
        self.ui.setupUi(self)
        self.setWindowTitle(f"Icon Editor — {component.name}")
        self.icon = Icon.from_dict(component.icon.to_dict())
-        self.inputs = deepcopy(component.inputs)
-        self.outputs = deepcopy(component.outputs)
+        self.ports = deepcopy(component.ports)
        self.tool_group = QButtonGroup(self)
        self.tool_group.setExclusive(True)
        self.tool_group.addButton(self.ui.pointerButton)
@@ -485,9 +484,17 @@ class IconEditorDialog(QDialog):
        self.scene.addRect(self.scene.sceneRect(), QPen(QColor("#64748b"), 0)).setZValue(-100)
        for element in self.icon.elements:
            self.scene.addItem(ShapeItem(element))
-        self._add_ports(self.inputs, "input", 0.0)
-        self._add_ports(self.outputs, "output", self.icon.width)
-        self.view.center_icon()
+        input_side = [port for port in self.ports if port.orientation != "output"]
+        output_side = [port for port in self.ports if port.orientation == "output"]
+        self._add_ports(input_side, "input", 0.0)
+        self._add_ports(output_side, "output", self.icon.width)
+        self._initial_fit_pending = True
+
+    def showEvent(self, event) -> None:  # noqa: N802 (Qt API name)
+        super().showEvent(event)
+        if self._initial_fit_pending:
+            self._initial_fit_pending = False
+            QTimer.singleShot(0, self.view.center_icon)

    def _add_ports(self, ports: list[Port], direction: str, default_x: float) -> None:
        spacing = self.icon.height / (len(ports) + 1)
--- a/BEdit/src/bedit/gui/graphics/workspace.py
+++ b/BEdit/src/bedit/gui/graphics/workspace.py
@@ -173,8 +173,16 @@ class ComponentGraphicsItem(QGraphicsObject):
            | QGraphicsItem.GraphicsItemFlag.ItemIsSelectable
            | QGraphicsItem.GraphicsItemFlag.ItemSendsGeometryChanges
        )
-        self.input_ports = self._create_ports(component.inputs, "target", 0.0)
-        self.output_ports = self._create_ports(component.outputs, "source", self.WIDTH)
+        self.input_ports = self._create_ports(
+            [port for port in component.ports if port.orientation != "output"],
+            "target",
+            0.0,
+        )
+        self.output_ports = self._create_ports(
+            [port for port in component.ports if port.orientation == "output"],
+            "source",
+            self.WIDTH,
+        )
        self.setTransformOriginPoint(self.hitbox.center())
        self.setRotation(component.rotation)
        self.name_label: NameLabelItem | None = None
@@ -371,8 +379,10 @@ class ConnectionGraphicsItem(QGraphicsPathItem):
        super().__init__()
        self.connection_id = connection.id
        self.name = connection.name
+        self.connection_type = connection.type
        self.source_is_junction = connection.source.junction is not None
        self.target_is_junction = connection.target.junction is not None
+        self.causality = connection.causality
        self.controller = controller
        self.style = style or ConnectionStyle()
        self.start = QPointF()
@@ -387,6 +397,19 @@ class ConnectionGraphicsItem(QGraphicsPathItem):
        self.name_label: NameLabelItem | None = None
        self.sync_name_label(connection)

+    def boundingRect(self) -> QRectF:  # noqa: N802
+        """Include custom arrowheads and causality marks in Qt's repaint area."""
+
+        decoration_margin = (
+            max(self.style.arrow_size, 6.0) + self.style.selected_width / 2 + 1.0
+        )
+        return super().boundingRect().adjusted(
+            -decoration_margin,
+            -decoration_margin,
+            decoration_margin,
+            decoration_margin,
+        )
+
    def sync_name_label(self, connection: Connection) -> None:
        visible = bool(connection.properties.get("showName", False))
        if not visible:
@@ -417,7 +440,11 @@ class ConnectionGraphicsItem(QGraphicsPathItem):
            self.setSelected(True)
        menu = QMenu()
        add_node_action = menu.addAction("Add Node")
-        add_junction_action = menu.addAction("Add Junction")
+        add_junction_action = (
+            menu.addAction("Add Junction")
+            if self.connection_type != "power"
+            else None
+        )
        menu.addSeparator()
        options_action = menu.addAction("Connection Options…")
        selected = menu.exec(event.screenPos())
@@ -425,7 +452,7 @@ class ConnectionGraphicsItem(QGraphicsPathItem):
            scene = self.scene()
            if isinstance(scene, GraphScene):
                scene.add_route_node("connection", self.connection_id, event.scenePos())
-        elif selected is add_junction_action:
+        elif add_junction_action is not None and selected is add_junction_action:
            scene = self.scene()
            if isinstance(scene, GraphScene):
                scene.add_connection_junction(self.connection_id, event.scenePos())
@@ -485,22 +512,62 @@ class ConnectionGraphicsItem(QGraphicsPathItem):
            handle.setVisible(self.isSelected())

    @staticmethod
-    def _arrow(end: QPointF, direction: QPointF, size: float) -> QPolygonF:
+    def _arrow_points(
+        end: QPointF, direction: QPointF, size: float
+    ) -> tuple[QPointF, QPointF, QPointF]:
        length = max(0.001, (direction.x() ** 2 + direction.y() ** 2) ** 0.5)
        unit = QPointF(direction.x() / length, direction.y() / length)
        normal = QPointF(-unit.y(), unit.x())
        base = end - unit * size
-        return QPolygonF([end, base + normal * size * 0.45, base - normal * size * 0.45])
+        return end, base + normal * size * 0.45, base - normal * size * 0.45
+
+    def _draw_arrow(
+        self, painter: QPainter, end: QPointF, direction: QPointF
+    ) -> None:
+        tip, left, right = self._arrow_points(
+            end, direction, self.style.arrow_size
+        )
+        color = self.pen().color()
+        if self.style.arrow_style == "filled":
+            painter.setPen(Qt.PenStyle.NoPen)
+            painter.setBrush(color)
+            painter.drawPolygon(QPolygonF([tip, left, right]))
+            return
+        painter.setPen(QPen(color, self.pen().widthF(), Qt.PenStyle.SolidLine))
+        painter.setBrush(Qt.BrushStyle.NoBrush)
+        painter.drawLine(tip, left)
+        if self.style.arrow_style == "open":
+            painter.drawLine(tip, right)
+
+    def _draw_causality_mark(
+        self, painter: QPainter, point: QPointF, direction: QPointF, *, warning: bool
+    ) -> None:
+        length = max(0.001, (direction.x() ** 2 + direction.y() ** 2) ** 0.5)
+        normal = QPointF(-direction.y() / length, direction.x() / length)
+        half_length = 6.0
+        color = QColor("#c25a00") if warning else self.pen().color()
+        painter.setPen(QPen(color, max(2.0, self.pen().widthF()), Qt.PenStyle.SolidLine))
+        painter.drawLine(point - normal * half_length, point + normal * half_length)

    def paint(self, painter: QPainter, option, widget=None) -> None:
        super().paint(painter, option, widget)
-        painter.setPen(Qt.PenStyle.NoPen)
-        painter.setBrush(self.pen().color())
        if self.style.arrow_at_target and not self.target_is_junction:
-            painter.drawPolygon(self._arrow(self.end, self.end_direction, self.style.arrow_size))
+            self._draw_arrow(painter, self.end, self.end_direction)
        if self.style.arrow_at_source and not self.source_is_junction:
-            painter.drawPolygon(
-                self._arrow(self.start, -self.start_direction, self.style.arrow_size)
+            self._draw_arrow(painter, self.start, -self.start_direction)
+        if self.causality in {"source", "warn_source"}:
+            self._draw_causality_mark(
+                painter,
+                self.start,
+                self.start_direction,
+                warning=self.causality == "warn_source",
+            )
+        elif self.causality in {"target", "warn_target"}:
+            self._draw_causality_mark(
+                painter,
+                self.end,
+                self.end_direction,
+                warning=self.causality == "warn_target",
            )


@@ -882,12 +949,12 @@ class GraphScene(QGraphicsScene):
        owner = self.controller.active_component
        if owner is None or owner.implementation_kind != "graph":
            return
-        for port in owner.inputs:
+        for port in (port for port in owner.ports if port.orientation != "output"):
            item = InterfaceTerminalItem(port, "input", self.controller)
            self.addItem(item)
            item.setPos(port.x, port.y)
            self.input_items[port.id] = item
-        for port in owner.outputs:
+        for port in (port for port in owner.ports if port.orientation == "output"):
            item = InterfaceTerminalItem(port, "output", self.controller)
            self.addItem(item)
            item.setPos(port.x, port.y)
@@ -1207,9 +1274,23 @@ class GraphScene(QGraphicsScene):
        def add_pairs(
            source_item: ComponentGraphicsItem, target_item: ComponentGraphicsItem
        ) -> None:
-            for output in source_item.component.outputs:
-                for input_port in target_item.component.inputs:
-                    if not PortTypeRegistry.compatible(output.type, input_port.type):
+            source_ports = [
+                port
+                for port in source_item.component.ports
+                if port.orientation in {"output", "indifferent"}
+            ]
+            for output in source_ports:
+                for input_port in (
+                    port
+                    for port in target_item.component.ports
+                    if port.orientation in {"input", "indifferent"}
+                ):
+                    if not PortTypeRegistry.compatible(
+                        output.type,
+                        input_port.type,
+                        output.domain,
+                        input_port.domain,
+                    ):
                        continue
                    source = Endpoint(block=source_item.component_id, port=output.id)
                    target = Endpoint(block=target_item.component_id, port=input_port.id)
@@ -1238,9 +1319,15 @@ class GraphScene(QGraphicsScene):
        choices: list[ConnectionChoice] = []
        interface = Endpoint(interface=terminal.port.id)
        if terminal.direction == "input":
-            for port in component.component.inputs:
+            for port in (
+                port
+                for port in component.component.ports
+                if port.orientation in {"input", "indifferent"}
+            ):
                target = Endpoint(block=component.component_id, port=port.id)
-                if not PortTypeRegistry.compatible(terminal.port.type, port.type):
+                if not PortTypeRegistry.compatible(
+                    terminal.port.type, port.type, terminal.port.domain, port.domain
+                ):
                    continue
                if not self.controller.endpoint_accepts_connection(interface, "source"):
                    continue
@@ -1254,9 +1341,16 @@ class GraphScene(QGraphicsScene):
                    )
                )
        else:
-            for port in component.component.outputs:
+            ports = [
+                port
+                for port in component.component.ports
+                if port.orientation in {"output", "indifferent"}
+            ]
+            for port in ports:
                source = Endpoint(block=component.component_id, port=port.id)
-                if not PortTypeRegistry.compatible(port.type, terminal.port.type):
+                if not PortTypeRegistry.compatible(
+                    port.type, terminal.port.type, port.domain, terminal.port.domain
+                ):
                    continue
                if not self.controller.endpoint_accepts_connection(source, "source"):
                    continue
@@ -1278,7 +1372,11 @@ class GraphScene(QGraphicsScene):
    ) -> list[ConnectionChoice]:
        choices: list[ConnectionChoice] = []
        source = junction.endpoint
-        for port in component.component.inputs:
+        for port in (
+            port
+            for port in component.component.ports
+            if port.orientation in {"input", "indifferent"}
+        ):
            target = Endpoint(block=component.component_id, port=port.id)
            if not PortTypeRegistry.compatible(junction.junction.type, port.type):
                continue
@@ -1559,6 +1657,8 @@ class GraphScene(QGraphicsScene):
        graphics = self.connection_items.get(connection_id)
        if connection is None or graphics is None:
            return
+        if connection.type == "power":
+            return
        snapped = _snapped(position)
        anchors = [graphics.start, *points, graphics.end]

@@ -1809,8 +1909,7 @@ class GraphWorkspaceView(QGraphicsView):
            return
        blocks: set[str] = set()
        connections: set[str] = set()
-        inputs: set[str] = set()
-        outputs: set[str] = set()
+        ports: set[str] = set()
        annotations: set[str] = set()
        for item in self.scene().selectedItems():
            if isinstance(item, ComponentGraphicsItem):
@@ -1818,10 +1917,10 @@ class GraphWorkspaceView(QGraphicsView):
            elif isinstance(item, ConnectionGraphicsItem):
                connections.add(item.connection_id)
            elif isinstance(item, InterfaceTerminalItem):
-                (inputs if item.direction == "input" else outputs).add(item.port.id)
+                ports.add(item.port.id)
            elif isinstance(item, (AnnotationGraphicsItem, LineAnnotationGraphicsItem)):
                annotations.add(item.annotation_id)
-        self.controller.delete_selection(blocks, connections, inputs, outputs)
+        self.controller.delete_selection(blocks, connections, ports)
        self.controller.delete_annotations(annotations)

    def has_selected_components(self) -> bool:
--- a/BEdit/src/bedit/gui/main_window.py
+++ b/BEdit/src/bedit/gui/main_window.py
@@ -181,6 +181,7 @@ class MainWindow(QMainWindow):
        )
        self.ui.actionGraphParameters.triggered.connect(self.show_graph_parameters)
        self.ui.actionCompose.triggered.connect(self.compose_active_graph)
+        self.ui.actionExportModel.triggered.connect(self.export_model)
        self.ui.actionSimulationWindow.triggered.connect(self.show_simulation_window)
        self.ui.actionRunSimulation.triggered.connect(self.run_simulation)
        self.document_controller.undo_stack.canUndoChanged.connect(self.ui.actionUndo.setEnabled)
@@ -261,6 +262,35 @@ class MainWindow(QMainWindow):
            self.log.error("Composition failed: %s", error)
            QMessageBox.warning(self, "Cannot compose", str(error))

+    @Slot()
+    def export_model(self) -> None:
+        try:
+            model_name, source = self.document_controller.compose_active_graph_source()
+        except ValueError as error:
+            self.log.error("Model export composition failed: %s", error)
+            QMessageBox.warning(self, "Cannot Export Model", str(error))
+            return
+        file_name, _selected_filter = QFileDialog.getSaveFileName(
+            self,
+            "Export OpenModelica Model",
+            f"{model_name}.mo",
+            "Modelica Models (*.mo);;All Files (*)",
+        )
+        if not file_name:
+            return
+        path = Path(file_name)
+        if not path.suffix:
+            path = path.with_suffix(".mo")
+        temporary_path = path.with_suffix(path.suffix + ".tmp")
+        try:
+            temporary_path.write_text(source, encoding="utf-8")
+            temporary_path.replace(path)
+        except OSError as error:
+            self.log.error("Could not export model %s: %s", path, error)
+            QMessageBox.critical(self, "Cannot Export Model", str(error))
+            return
+        self.log.info("Exported OpenModelica model to %s", path)
+
    @Slot()
    def show_simulation_window(self) -> None:
        self._simulation_window.show()
@@ -274,7 +304,7 @@ class MainWindow(QMainWindow):
        self.show_simulation_window()
        try:
            self.document_controller.run_simulation(*callbacks)
-            window.set_model_name(self.simulation.model_name)
+            window.prepare_run_model(self.simulation.model_name)
        except Exception as error:
            self.log.exception("Simulation run failed")
            window.report_start_error(error)
@@ -307,6 +337,7 @@ class MainWindow(QMainWindow):
            self.ui.actionSimulationSettings.setEnabled(False)
            self.ui.actionGraphParameters.setEnabled(False)
            self.ui.actionCompose.setEnabled(False)
+            self.ui.actionExportModel.setEnabled(False)
            self.ui.actionRunSimulation.setEnabled(False)
            self._update_edit_actions()
            return
@@ -318,6 +349,7 @@ class MainWindow(QMainWindow):
        self.ui.actionSimulationSettings.setEnabled(is_graph)
        self.ui.actionGraphParameters.setEnabled(is_graph)
        self.ui.actionCompose.setEnabled(is_graph)
+        self.ui.actionExportModel.setEnabled(is_graph)
        self.ui.actionRunSimulation.setEnabled(is_graph)
        self.ui.workspaceModeLabel.setText("Graph" if is_graph else "Text")
        self.ui.workspaceStack.setCurrentWidget(
@@ -505,9 +537,10 @@ class MainWindow(QMainWindow):
        if component is None:
            return
        self.ui.textDefinitionEditor.set_definition(
+            component.source.get("declarations", ""),
+            component.source.get("initialEquations", ""),
            component.source.get("equations", ""),
-            component.inputs,
-            component.outputs,
+            component.ports,
            component.parameters,
        )

@@ -522,7 +555,8 @@ class MainWindow(QMainWindow):
        answer = QMessageBox.question(
            self,
            "Apply text component changes?",
-            "The text component has unapplied equation, port, or parameter changes.",
+            "The text component has unapplied declaration, initial-equation, "
+            "equation, port, or parameter changes.",
            QMessageBox.StandardButton.Apply
            | QMessageBox.StandardButton.Discard
            | QMessageBox.StandardButton.Cancel,
@@ -534,12 +568,13 @@ class MainWindow(QMainWindow):
    @Slot()
    def apply_text_definition(self) -> bool:
        try:
-            inputs, outputs = self.ui.textDefinitionEditor.ports
+            ports = self.ui.textDefinitionEditor.ports
            self._applying_text_definition = True
            try:
                self.document_controller.replace_active_text_definition(
-                    inputs,
-                    outputs,
+                    ports,
+                    self.ui.textDefinitionEditor.declarations,
+                    self.ui.textDefinitionEditor.initial_equations,
                    self.ui.textDefinitionEditor.equations,
                    self.ui.textDefinitionEditor.parameters,
                )
@@ -606,12 +641,23 @@ class MainWindow(QMainWindow):
        )
        if not filename:
            return
+        self.open_document_path(Path(filename), check_unsaved=False)
+
+    def open_document_path(self, path: Path, *, check_unsaved: bool = True) -> bool:
+        """Open a document path selected by the UI or supplied at startup."""
+
+        if check_unsaved and (
+            not self._resolve_source_edits() or not self._maybe_save()
+        ):
+            return False
        try:
-            self.document_controller.load(Path(filename))
-            self.log.info("Opened document %s", filename)
+            self.document_controller.load(path)
+            self.log.info("Opened document %s", path)
        except (OSError, ValueError) as error:
-            self.log.error("Could not open document %s: %s", filename, error)
+            self.log.error("Could not open document %s: %s", path, error)
            QMessageBox.critical(self, "Could not open graph", str(error))
+            return False
+        return True

    @Slot()
    def save_document(self) -> bool:
@@ -672,6 +718,8 @@ class MainWindow(QMainWindow):
        if scene is not None:
            scene.update()
        self.ui.graphView.viewport().update()
+        self.ui.textDefinitionEditor.ui.declarationsEdit.reload_highlighting()
+        self.ui.textDefinitionEditor.ui.initialEquationsEdit.reload_highlighting()
        self.ui.textDefinitionEditor.ui.equationsEdit.reload_highlighting()

    def _document_opened_changed(self, opened: bool) -> None:
@@ -779,9 +827,8 @@ class MainWindow(QMainWindow):
        elif selected is ports_action:
            dialog = PortOptionsDialog(component, self)
            if dialog.exec() == dialog.DialogCode.Accepted:
-                old_inputs, old_outputs = deepcopy(component.inputs), deepcopy(component.outputs)
-                component.inputs = dialog.inputs
-                component.outputs = dialog.outputs
+                old_ports = deepcopy(component.ports)
+                component.ports = dialog.ports
                library = next(
                    (
                        library
@@ -795,7 +842,7 @@ class MainWindow(QMainWindow):
                        library.document.validate()
                        DocumentSerializer.save(library.document, Path(library.source_path))
                except (OSError, ValueError) as error:
-                    component.inputs, component.outputs = old_inputs, old_outputs
+                    component.ports = old_ports
                    self.log.error("Could not change library ports: %s", error)
                    QMessageBox.warning(self, "Cannot change library ports", str(error))
                self.library_tree_model.rebuild()
@@ -837,7 +884,7 @@ class MainWindow(QMainWindow):
            return
        try:
            self.document_controller.edit_component_ports(
-                component_id, dialog.inputs, dialog.outputs
+                component_id, dialog.ports
            )
        except ValueError as error:
            self.log.error("Could not change component ports: %s", error)
@@ -873,8 +920,7 @@ class MainWindow(QMainWindow):
                    component_id,
                    dialog.ui.nameEdit.text().strip(),
                    dialog.edited_icon,
-                    dialog.edited_inputs,
-                    dialog.edited_outputs,
+                    dialog.edited_ports,
                    dialog.ui.showSubtreeCheckBox.isChecked(),
                    dialog.ui.showNameCheckBox.isChecked(),
                )
@@ -887,8 +933,7 @@ class MainWindow(QMainWindow):
        owner = self.document_controller.active_component
        if owner is None:
            return
-        ports = owner.inputs if direction == "input" else owner.outputs
-        port = next((item for item in ports if item.id == port_id), None)
+        port = next((item for item in owner.ports if item.id == port_id), None)
        if port is None:
            return
        dialog = ItemOptionsDialog(f"{direction.title()} Options", port.name, self)
--- a/BEdit/src/bedit/gui/models/library_tree.py
+++ b/BEdit/src/bedit/gui/models/library_tree.py
@@ -1,6 +1,6 @@
 import json

-from PySide6.QtCore import QByteArray, QMimeData, QModelIndex, Qt, Signal
+from PySide6.QtCore import QByteArray, QMimeData, QModelIndex, QSignalBlocker, Qt, Signal
 from PySide6.QtGui import QStandardItem, QStandardItemModel

 from bedit.core.model import Component
@@ -80,8 +80,24 @@ class DocumentTreeModel(LibraryTreeModel):
        controller.componentMoved.connect(lambda _component_id, _position: self.rebuild())
        controller.connectionAdded.connect(lambda _connection_id: self.rebuild())
        controller.connectionRemoved.connect(lambda _connection_id: self.rebuild())
+        controller.documentNameChanged.connect(self._document_name_changed)
+        self.itemChanged.connect(self._document_item_changed)
        self.rebuild()

+    def _document_item_changed(self, item: QStandardItem) -> None:
+        if item.data(ITEM_KIND_ROLE) != "current-document":
+            return
+        try:
+            self.controller.rename_document(item.text())
+        except ValueError:
+            self.rebuild()
+
+    def _document_name_changed(self, name: str) -> None:
+        root = self.item(0)
+        if root is not None:
+            with QSignalBlocker(self):
+                root.setText(name)
+
    def rebuild(self) -> None:
        self.clear()
        self.setHorizontalHeaderLabels(["Document"])
--- a/BEdit/src/bedit/gui/simulation_window.py
+++ b/BEdit/src/bedit/gui/simulation_window.py
@@ -1,17 +1,33 @@
 import re
 from pathlib import Path

+from matplotlib.backend_bases import MouseButton
+from matplotlib.backends.backend_qtagg import FigureCanvasQTAgg, NavigationToolbar2QT
+from matplotlib.figure import Figure
 from PySide6.QtCore import Qt, Signal
-from PySide6.QtWidgets import QFileDialog, QMainWindow, QMessageBox
+from PySide6.QtGui import QCloseEvent
+from PySide6.QtWidgets import (
+    QFileDialog,
+    QInputDialog,
+    QMainWindow,
+    QMenu,
+    QMessageBox,
+    QTreeWidgetItem,
+    QVBoxLayout,
+    QWidget,
+)

 from bedit.core.simulation.openmodelica import SimulationMessage, SimulationProgress
 from bedit.core.simulation.results import (
    SimulationExecutionResult,
+    SimulationGraph,
    SimulationResults,
+    SimulationTrace,
    load_simulation_results,
    save_simulation_results,
 )
 from bedit.gui.generated.ui_simulation_window import Ui_SimulationWindow
+from bedit.gui.preferences import application_settings


 class SimulationWindow(QMainWindow):
@@ -26,9 +42,12 @@ class SimulationWindow(QMainWindow):
        super().__init__(parent)
        self.ui = Ui_SimulationWindow()
        self.ui.setupUi(self)
+        self.settings = application_settings()
        self._running = False
        self._run_generation = 0
        self._file_path: Path | None = None
+        self._rebuilding_graph_tabs = False
+        self._updating_signal_checks = False
        self.results = SimulationResults()
        self._connect_actions()
        self._populate_view_menu()
@@ -36,6 +55,7 @@ class SimulationWindow(QMainWindow):
            self.ui.statusDock, self.ui.logDock, Qt.Orientation.Vertical
        )
        self.ui.statusDock.setFixedHeight(self.ui.statusDock.sizeHint().height())
+        self._restore_window_layout()
        self.progressReceived.connect(self._show_progress)
        self.messageReceived.connect(self._show_message)
        self.simulationFinished.connect(self._show_finished)
@@ -52,19 +72,57 @@ class SimulationWindow(QMainWindow):
            lambda: QMessageBox.aboutQt(self, "About Qt Framework")
        )
        self.ui.actionToggleResults.toggled.connect(self.ui.centralWidget.setVisible)
+        self.ui.actionAddGraph.triggered.connect(self.add_graph_tab)
+        self.ui.actionRemoveGraph.triggered.connect(self.remove_current_graph_tab)
+        self.ui.graphTabs.tabBarDoubleClicked.connect(self.rename_graph_tab)
+        self.ui.graphTabs.tabBar().tabMoved.connect(self._move_graph_tab)
+        self.ui.graphTabs.currentChanged.connect(self._current_graph_changed)
+        self.ui.signalsTree.itemChanged.connect(self._signal_check_changed)
+        self.ui.signalsTree.customContextMenuRequested.connect(
+            self.show_signal_context_menu
+        )

    def _populate_view_menu(self) -> None:
        self.ui.menuPanels.addAction(self.ui.actionToggleResults)
-        for panel in (self.ui.statusDock, self.ui.logDock):
+        for panel in (self.ui.statusDock, self.ui.logDock, self.ui.signalsDock):
            self.ui.menuPanels.addAction(panel.toggleViewAction())
        self.ui.menuToolbars.addAction(self.ui.fileToolbar.toggleViewAction())
+        self.ui.menuToolbars.addAction(self.ui.workspaceToolbar.toggleViewAction())

-    def begin_run(self, model_name: str = "") -> tuple:
-        """Reset the viewer and return callbacks bound to this run."""
+    def _restore_window_layout(self) -> None:
+        geometry = self.settings.value("simulationWindow/geometry")
+        if geometry is not None:
+            self.restoreGeometry(geometry)
+        state = self.settings.value("simulationWindow/state")
+        if state is not None:
+            self.restoreState(state)
+        results_visible = self.settings.value(
+            "simulationWindow/resultsVisible", True, type=bool
+        )
+        self.ui.actionToggleResults.setChecked(results_visible)

-        self.clear(model_name=model_name)
+    def _save_window_layout(self) -> None:
+        self.settings.setValue("simulationWindow/geometry", self.saveGeometry())
+        self.settings.setValue("simulationWindow/state", self.saveState())
+        self.settings.setValue(
+            "simulationWindow/resultsVisible",
+            self.ui.actionToggleResults.isChecked(),
+        )
+        self.settings.sync()
+
+    def begin_run(self) -> tuple:
+        """Reset transient run state while retaining the current workspace."""
+
+        self._run_generation += 1
        generation = self._run_generation
        self._running = True
+        self._file_path = None
+        self.results.status = {}
+        self.results.messages.clear()
+        self.results.metadata.clear()
+        self.ui.progressBar.setValue(0)
+        self.ui.timeLabel.setText("Time: 0 s")
+        self.ui.messageList.clear()
        self.ui.statusLabel.setText("Preparing simulation…")
        return (
            lambda progress: self._report_progress(generation, progress),
@@ -73,10 +131,19 @@ class SimulationWindow(QMainWindow):
            lambda error: self._report_error(generation, error),
        )

-    def set_model_name(self, model_name: str | None) -> None:
-        if model_name:
+    def prepare_run_model(self, model_name: str | None) -> None:
+        """Retain graph configuration only when rerunning the same model."""
+
+        if not model_name:
+            return
+        if self.results.model_name != model_name:
+            self.results = SimulationResults(model_name=model_name)
+            self.clear_result_views()
+            self.load_result_views()
+        else:
            self.results.model_name = model_name
-            self._update_title()
+        self.ui.statusLabel.setText("Preparing simulation…")
+        self._update_title()

    def clear(self, checked: bool = False, *, model_name: str = "") -> None:
        """Discard the displayed run and prepare an empty results document."""
@@ -91,6 +158,7 @@ class SimulationWindow(QMainWindow):
        self.ui.timeLabel.setText("Time: 0 s")
        self.ui.messageList.clear()
        self.clear_result_views()
+        self.load_result_views()
        self._update_title()

    def clear_result_views(self) -> None:
@@ -100,9 +168,10 @@ class SimulationWindow(QMainWindow):
        ``resultsLayout`` and reset here.
        """

-        self.ui.resultsPlaceholder.setText(
-            "Simulation graphs and result controls can be added here."
-        )
+        self._rebuilding_graph_tabs = True
+        self._clear_graph_tab_widgets()
+        self._rebuilding_graph_tabs = False
+        self.ui.signalsTree.clear()

    def load_result_views(self) -> None:
        """Populate custom plots from ``self.results.data`` and traces.
@@ -110,14 +179,226 @@ class SimulationWindow(QMainWindow):
        This is the intended integration point for a future plotting widget.
        """

-        data_count = len(self.results.data)
-        trace_count = len(self.results.traces)
-        if data_count or trace_count:
-            sample_count = len(next(iter(self.results.data.values()), []))
-            self.ui.resultsPlaceholder.setText(
-                f"{data_count} data column(s), {sample_count} sample(s), and "
-                f"{trace_count} configured trace(s) loaded; add graph rendering here."
+        self._rebuild_graph_tabs()
+        self._rebuild_signal_tree()
+
+    def _rebuild_graph_tabs(self) -> None:
+        current_page = self.ui.graphTabs.currentWidget()
+        current_graph_id = (
+            current_page.graph_id
+            if isinstance(current_page, GraphWorkspacePage)
+            else None
+        )
+        self._rebuilding_graph_tabs = True
+        self._clear_graph_tab_widgets()
+        for graph in self.results.graphs:
+            self.ui.graphTabs.addTab(
+                GraphWorkspacePage(graph, self.results), graph.title
            )
+        if current_graph_id is not None:
+            for index, graph in enumerate(self.results.graphs):
+                if graph.id == current_graph_id:
+                    self.ui.graphTabs.setCurrentIndex(index)
+                    break
+        self._rebuilding_graph_tabs = False
+        self._update_graph_actions()
+        self._sync_signal_checks()
+
+    def _clear_graph_tab_widgets(self) -> None:
+        while self.ui.graphTabs.count():
+            page = self.ui.graphTabs.widget(0)
+            self.ui.graphTabs.removeTab(0)
+            page.deleteLater()
+
+    def add_graph_tab(self) -> None:
+        used_titles = {graph.title for graph in self.results.graphs}
+        number = 1
+        while f"Graph {number}" in used_titles:
+            number += 1
+        graph = SimulationGraph(title=f"Graph {number}")
+        self.results.graphs.append(graph)
+        index = self.ui.graphTabs.addTab(
+            GraphWorkspacePage(graph, self.results), graph.title
+        )
+        self.ui.graphTabs.setCurrentIndex(index)
+        self._update_graph_actions()
+
+    def remove_current_graph_tab(self) -> None:
+        index = self.ui.graphTabs.currentIndex()
+        if index < 0 or index >= len(self.results.graphs):
+            return
+        self.results.graphs.pop(index)
+        page = self.ui.graphTabs.widget(index)
+        self.ui.graphTabs.removeTab(index)
+        page.deleteLater()
+        self._update_graph_actions()
+        self._sync_signal_checks()
+
+    def rename_graph_tab(self, index: int) -> None:
+        if index < 0 or index >= len(self.results.graphs):
+            return
+        graph = self.results.graphs[index]
+        title, accepted = QInputDialog.getText(
+            self, "Rename Graph", "Title:", text=graph.title
+        )
+        title = title.strip()
+        if accepted and title:
+            graph.title = title
+            self.ui.graphTabs.setTabText(index, title)
+            page = self.ui.graphTabs.widget(index)
+            if isinstance(page, GraphWorkspacePage):
+                page.refresh_chart()
+
+    def _move_graph_tab(self, old_index: int, new_index: int) -> None:
+        if self._rebuilding_graph_tabs or old_index == new_index:
+            return
+        graph = self.results.graphs.pop(old_index)
+        self.results.graphs.insert(new_index, graph)
+        self._sync_signal_checks()
+
+    def _update_graph_actions(self) -> None:
+        self.ui.actionRemoveGraph.setEnabled(bool(self.results.graphs))
+
+    def _rebuild_signal_tree(self) -> None:
+        """Build a hierarchy while retaining each leaf's complete signal name."""
+
+        tree = self.ui.signalsTree
+        self._updating_signal_checks = True
+        try:
+            tree.clear()
+            items: dict[tuple[str, ...], QTreeWidgetItem] = {}
+            for signal_name in sorted(self.results.data, key=str.casefold):
+                parts = _signal_tree_parts(signal_name)
+                if not parts:
+                    continue
+                parent = tree.invisibleRootItem()
+                for depth, part in enumerate(parts, start=1):
+                    path = parts[:depth]
+                    item = items.get(path)
+                    if item is None:
+                        item = QTreeWidgetItem(parent, [part])
+                        items[path] = item
+                    parent = item
+                parent.setData(0, Qt.ItemDataRole.UserRole, signal_name)
+                metadata = self.results.signal_metadata.get(signal_name, {})
+                unit = metadata.get("unit", "")
+                if unit:
+                    parent.setText(0, f"{parts[-1]} [{unit}]")
+                tooltip = signal_name
+                details = [
+                    metadata.get("quantity", ""),
+                    f"Unit: {unit}" if unit else "",
+                    metadata.get("description", ""),
+                ]
+                details = [detail for detail in details if detail]
+                if details:
+                    tooltip += "\n" + "\n".join(details)
+                parent.setToolTip(0, tooltip)
+                parent.setFlags(parent.flags() | Qt.ItemFlag.ItemIsUserCheckable)
+                parent.setCheckState(0, Qt.CheckState.Unchecked)
+            tree.expandToDepth(0)
+        finally:
+            self._updating_signal_checks = False
+        self._sync_signal_checks()
+
+    def _current_graph_changed(self, _index: int) -> None:
+        if not self._rebuilding_graph_tabs:
+            self._sync_signal_checks()
+
+    def _current_graph(self) -> SimulationGraph | None:
+        index = self.ui.graphTabs.currentIndex()
+        if 0 <= index < len(self.results.graphs):
+            return self.results.graphs[index]
+        return None
+
+    def _sync_signal_checks(self) -> None:
+        graph = self._current_graph()
+        enabled = {trace.name for trace in graph.traces} if graph else set()
+        self._updating_signal_checks = True
+        try:
+            root = self.ui.signalsTree.invisibleRootItem()
+            pending = [root.child(index) for index in range(root.childCount())]
+            while pending:
+                item = pending.pop()
+                pending.extend(
+                    item.child(index) for index in range(item.childCount())
+                )
+                signal_name = item.data(0, Qt.ItemDataRole.UserRole)
+                if isinstance(signal_name, str):
+                    item.setCheckState(
+                        0,
+                        Qt.CheckState.Checked
+                        if signal_name in enabled
+                        else Qt.CheckState.Unchecked,
+                    )
+        finally:
+            self._updating_signal_checks = False
+        self.ui.signalsTree.setEnabled(graph is not None)
+
+    def _signal_check_changed(self, item: QTreeWidgetItem, _column: int) -> None:
+        if self._updating_signal_checks:
+            return
+        signal_name = item.data(0, Qt.ItemDataRole.UserRole)
+        graph = self._current_graph()
+        if not isinstance(signal_name, str) or graph is None:
+            return
+        enabled = item.checkState(0) == Qt.CheckState.Checked
+        existing = next(
+            (trace for trace in graph.traces if trace.name == signal_name), None
+        )
+        if enabled and existing is None:
+            metadata = self.results.signal_metadata.get(signal_name, {})
+            graph.traces.append(
+                SimulationTrace(
+                    name=signal_name,
+                    y_label=metadata.get("quantity", ""),
+                    unit=metadata.get("unit", ""),
+                )
+            )
+        elif not enabled and existing is not None:
+            graph.traces.remove(existing)
+        page = self.ui.graphTabs.currentWidget()
+        if isinstance(page, GraphWorkspacePage):
+            page.refresh_chart()
+
+    def selected_signal_names(self) -> list[str]:
+        """Return full column names selected for future plotting actions."""
+
+        names = []
+        for item in self.ui.signalsTree.selectedItems():
+            name = item.data(0, Qt.ItemDataRole.UserRole)
+            if isinstance(name, str):
+                names.append(name)
+        return names
+
+    def show_signal_context_menu(self, position) -> None:
+        item = self.ui.signalsTree.itemAt(position)
+        signal_name = (
+            item.data(0, Qt.ItemDataRole.UserRole) if item is not None else None
+        )
+        graph = self._current_graph()
+        if not isinstance(signal_name, str) or graph is None:
+            return
+        menu = QMenu(self)
+        use_as_x_action = menu.addAction("Use as X Axis")
+        use_as_x_action.setCheckable(True)
+        use_as_x_action.setChecked(graph.x_axis == signal_name)
+        selected = menu.exec(
+            self.ui.signalsTree.viewport().mapToGlobal(position)
+        )
+        if selected is use_as_x_action:
+            self.set_x_axis_signal(signal_name)
+
+    def set_x_axis_signal(self, signal_name: str) -> None:
+        """Set the current graph's persisted horizontal data column."""
+
+        graph = self._current_graph()
+        if graph is None or signal_name not in self.results.data:
+            return
+        graph.x_axis = signal_name
+        page = self.ui.graphTabs.currentWidget()
+        if isinstance(page, GraphWorkspacePage):
+            page.refresh_chart()

    def open_results(self) -> None:
        file_name, _selected_filter = QFileDialog.getOpenFileName(
@@ -231,6 +512,24 @@ class SimulationWindow(QMainWindow):
        self.results.status.update(phase="Simulation finished", progress=10000)
        if isinstance(result, SimulationExecutionResult):
            self.results.data = result.data
+            self.results.signal_metadata = result.signal_metadata
+            available_signals = set(result.data)
+            for graph in self.results.graphs:
+                graph.traces = [
+                    trace
+                    for trace in graph.traces
+                    if trace.name in available_signals
+                ]
+                for trace in graph.traces:
+                    metadata = result.signal_metadata.get(trace.name, {})
+                    trace.unit = metadata.get("unit", "")
+                    trace.y_label = metadata.get("quantity", "")
+                if graph.x_axis not in available_signals:
+                    graph.x_axis = (
+                        "time"
+                        if "time" in available_signals
+                        else next(iter(result.data), "")
+                    )
            self.results.metadata["processReturnCode"] = result.return_code
            self.results.metadata["sourceResultFile"] = Path(result.result_file).name
        else:
@@ -256,11 +555,221 @@ class SimulationWindow(QMainWindow):
            "<p>View live progress and open or save simulation results.</p>",
        )

+    def closeEvent(self, event: QCloseEvent) -> None:  # noqa: N802 (Qt API name)
+        self._save_window_layout()
+        super().closeEvent(event)
+
    @property
    def is_running(self) -> bool:
        return self._running


+class GraphWorkspacePage(QWidget):
+    """Matplotlib view of one persisted simulation graph definition."""
+
+    def __init__(
+        self, graph: SimulationGraph, results: SimulationResults, parent=None
+    ) -> None:
+        super().__init__(parent)
+        self.graph_id = graph.id
+        self.graph = graph
+        self.results = results
+        self.plot_layout = QVBoxLayout(self)
+        self.figure = Figure(layout="constrained")
+        self.canvas = InteractiveFigureCanvas(self.figure)
+        self.axes = self.figure.add_subplot(111)
+        self.canvas.axes = self.axes
+        self.navigation_toolbar = GraphNavigationToolbar(self.canvas, self)
+        self.canvas.navigation_toolbar = self.navigation_toolbar
+        self.plot_layout.addWidget(self.navigation_toolbar)
+        self.plot_layout.addWidget(self.canvas)
+        self.refresh_chart()
+
+    def refresh_chart(self) -> None:
+        self.axes.clear()
+        x_values = self.results.data.get(self.graph.x_axis)
+        for trace in self.graph.traces:
+            y_values = self.results.data.get(trace.name)
+            if y_values is None:
+                continue
+            horizontal = x_values if x_values is not None else range(len(y_values))
+            sample_count = min(len(horizontal), len(y_values))
+            color = trace.properties.get("color")
+            unit = trace.unit or self.results.signal_metadata.get(
+                trace.name, {}
+            ).get("unit", "")
+            label = f"{trace.name} [{unit}]" if unit else trace.name
+            self.axes.plot(
+                list(horizontal)[:sample_count],
+                y_values[:sample_count],
+                label=label,
+                color=color if isinstance(color, str) and color else None,
+            )
+        self.axes.set_title(self.graph.title)
+        if x_values is not None:
+            x_unit = self.results.signal_metadata.get(
+                self.graph.x_axis, {}
+            ).get("unit", "")
+            x_label = (
+                f"{self.graph.x_axis} [{x_unit}]"
+                if x_unit
+                else self.graph.x_axis
+            )
+        else:
+            x_label = "sample"
+        self.axes.set_xlabel(x_label)
+        units = {
+            trace.unit
+            or self.results.signal_metadata.get(trace.name, {}).get("unit", "")
+            for trace in self.graph.traces
+            if self.results.data.get(trace.name) is not None
+        }
+        units.discard("")
+        if len(units) == 1:
+            self.axes.set_ylabel(next(iter(units)))
+        self.axes.grid(True, alpha=0.25)
+        if self.axes.lines:
+            self.axes.legend()
+        self.axes.relim()
+        self.axes.autoscale_view()
+        self.canvas.set_home_view()
+        self.canvas.draw_idle()
+
+
+class GraphNavigationToolbar(NavigationToolbar2QT):
+    """Navigation toolbar whose Home action includes direct canvas navigation."""
+
+    def home(self, *args) -> None:
+        del args
+        self.canvas.reset_home_view()
+
+
+class InteractiveFigureCanvas(FigureCanvasQTAgg):
+    """Matplotlib canvas with always-available wheel zoom and drag pan."""
+
+    def __init__(self, figure: Figure) -> None:
+        super().__init__(figure)
+        self.axes = None
+        self.navigation_toolbar = None
+        self._pan_start = None
+        self._home_view = None
+        self.mpl_connect("scroll_event", self._zoom_at_cursor)
+        self.mpl_connect("button_press_event", self._start_pan)
+        self.mpl_connect("motion_notify_event", self._pan)
+        self.mpl_connect("button_release_event", self._finish_pan)
+
+    def _toolbar_is_active(self) -> bool:
+        return bool(
+            self.navigation_toolbar is not None
+            and self.navigation_toolbar.mode
+        )
+
+    def set_home_view(self) -> None:
+        if self.axes is not None:
+            self._home_view = (self.axes.get_xlim(), self.axes.get_ylim())
+
+    def reset_home_view(self) -> None:
+        if self.axes is None or self._home_view is None:
+            return
+        x_limits, y_limits = self._home_view
+        self.axes.set_xlim(x_limits)
+        self.axes.set_ylim(y_limits)
+        self.draw_idle()
+
+    def _zoom_at_cursor(self, event) -> None:
+        if (
+            self.axes is None
+            or event.inaxes is not self.axes
+            or event.xdata is None
+            or event.ydata is None
+            or self._toolbar_is_active()
+        ):
+            return
+        scale = 0.8 if event.button == "up" else 1.25
+        left, right = self.axes.get_xlim()
+        bottom, top = self.axes.get_ylim()
+        self.axes.set_xlim(
+            event.xdata - (event.xdata - left) * scale,
+            event.xdata + (right - event.xdata) * scale,
+        )
+        self.axes.set_ylim(
+            event.ydata - (event.ydata - bottom) * scale,
+            event.ydata + (top - event.ydata) * scale,
+        )
+        self.draw_idle()
+
+    def _start_pan(self, event) -> None:
+        if (
+            self.axes is None
+            or event.inaxes is not self.axes
+            or event.button != MouseButton.LEFT
+            or self._toolbar_is_active()
+        ):
+            return
+        self._pan_start = (
+            event.x,
+            event.y,
+            self.axes.get_xlim(),
+            self.axes.get_ylim(),
+        )
+
+    def _pan(self, event) -> None:
+        if (
+            self.axes is None
+            or self._pan_start is None
+            or event.x is None
+            or event.y is None
+        ):
+            return
+        start_x, start_y, x_limits, y_limits = self._pan_start
+        width = max(self.axes.bbox.width, 1.0)
+        height = max(self.axes.bbox.height, 1.0)
+        delta_x = (event.x - start_x) * (x_limits[1] - x_limits[0]) / width
+        delta_y = (event.y - start_y) * (y_limits[1] - y_limits[0]) / height
+        self.axes.set_xlim(x_limits[0] - delta_x, x_limits[1] - delta_x)
+        self.axes.set_ylim(y_limits[0] - delta_y, y_limits[1] - delta_y)
+        self.draw_idle()
+
+    def _finish_pan(self, _event) -> None:
+        self._pan_start = None
+
+
 def _safe_file_stem(model_name: str) -> str:
    stem = re.sub(r"[^A-Za-z0-9_.-]+", "_", model_name).strip("._")
    return stem or "simulation"
+
+
+def _signal_tree_parts(signal_name: str) -> tuple[str, ...]:
+    """Split a result name into readable component, variable, and index levels.
+
+    OpenModelica emits state derivatives as names such as ``der(block.x)``.
+    Keep those traces available, but display them below a ``Derivatives`` group
+    on their owning component instead of creating a misleading top-level
+    ``der(block`` branch.
+    """
+
+    derivative = re.fullmatch(r"der\((.+)\)", signal_name)
+    if derivative is not None:
+        inner_name = derivative.group(1)
+        inner_parts = _signal_tree_parts(inner_name)
+        if inner_parts:
+            index_count = len(re.findall(r"\[[^\]]+\]", inner_name.rsplit(".", 1)[-1]))
+            variable_index = max(0, len(inner_parts) - index_count - 1)
+            return (
+                *inner_parts[:variable_index],
+                "Derivatives",
+                *inner_parts[variable_index:],
+            )
+        return ("Derivatives", signal_name)
+
+    parts: list[str] = []
+    for segment in signal_name.split("."):
+        if not segment:
+            continue
+        match = re.fullmatch(r"([^\[]+)((?:\[[^\]]+\])+)", segment)
+        if match is None:
+            parts.append(segment)
+            continue
+        parts.append(match.group(1))
+        parts.extend(re.findall(r"\[([^\]]+)\]", match.group(2)))
+    return tuple(parts)
--- a/BEdit/ui/main_window.ui
+++ b/BEdit/ui/main_window.ui
@@ -552,6 +552,7 @@
    <addaction name="actionSimulationSettings"/>
    <addaction name="actionGraphParameters"/>
    <addaction name="actionCompose"/>
+    <addaction name="actionExportModel"/>
    <addaction name="actionSimulationWindow"/>
    <addaction name="actionRunSimulation"/>
   </widget>
@@ -715,6 +716,18 @@
    <string>Show the simulation results window</string>
   </property>
  </action>
+  <action name="actionExportModel">
+   <property name="icon">
+    <iconset resource="../resources/resources.qrc">
+     <normaloff>:/icons/icons/document-save-as.png</normaloff>:/icons/icons/document-save-as.png</iconset>
+   </property>
+   <property name="text">
+    <string>Export Model…</string>
+   </property>
+   <property name="statusTip">
+    <string>Save the composed OpenModelica model to a file</string>
+   </property>
+  </action>
  <action name="actionNew">
   <property name="icon">
    <iconset resource="../resources/resources.qrc">
--- a/BEdit/ui/parameter_options_dialog.ui
+++ b/BEdit/ui/parameter_options_dialog.ui
@@ -2,13 +2,222 @@
 <ui version="4.0">
 <class>ParameterOptionsDialog</class>
 <widget class="QDialog" name="ParameterOptionsDialog">
-  <property name="geometry"><rect><x>0</x><y>0</y><width>620</width><height>380</height></rect></property>
-  <property name="windowTitle"><string>Parameter Options</string></property>
+  <property name="geometry">
+   <rect>
+    <x>0</x>
+    <y>0</y>
+    <width>720</width>
+    <height>328</height>
+   </rect>
+  </property>
+  <property name="windowTitle">
+   <string>Parameter Options</string>
+  </property>
  <layout class="QVBoxLayout" name="dialogLayout">
-   <item><widget class="QSplitter" name="parameterSplitter"><property name="orientation"><enum>Qt::Orientation::Horizontal</enum></property><widget class="QWidget" name="parameterListPanel"><layout class="QVBoxLayout" name="parameterListLayout"><item><widget class="QListWidget" name="parameterList"/></item><item><layout class="QHBoxLayout" name="parameterButtonsLayout"><item><widget class="QPushButton" name="addParameterButton"><property name="text"><string>Add Parameter</string></property></widget></item><item><widget class="QPushButton" name="removeParameterButton"><property name="text"><string>Remove Parameter</string></property></widget></item></layout></item></layout></widget><widget class="QWidget" name="parameterDetailsPanel"><layout class="QFormLayout" name="parameterDetailsForm"><item row="0" column="0"><widget class="QLabel" name="nameLabel"><property name="text"><string>Name:</string></property></widget></item><item row="0" column="1"><widget class="QLineEdit" name="nameEdit"/></item><item row="1" column="0"><widget class="QLabel" name="typeLabel"><property name="text"><string>Type:</string></property></widget></item><item row="1" column="1"><widget class="QLineEdit" name="typeEdit"/></item><item row="2" column="0"><widget class="QLabel" name="valueLabel"><property name="text"><string>Value:</string></property></widget></item><item row="2" column="1"><widget class="QLineEdit" name="valueEdit"/></item></layout></widget></widget></item>
-   <item><widget class="QDialogButtonBox" name="buttonBox"><property name="standardButtons"><set>QDialogButtonBox::StandardButton::Cancel|QDialogButtonBox::StandardButton::Ok</set></property></widget></item>
+   <item>
+    <widget class="QSplitter" name="parameterSplitter">
+     <property name="orientation">
+      <enum>Qt::Orientation::Horizontal</enum>
+     </property>
+     <widget class="QWidget" name="parameterListPanel">
+      <layout class="QVBoxLayout" name="parameterListLayout">
+       <item>
+        <widget class="QListWidget" name="parameterList"/>
+       </item>
+       <item>
+        <layout class="QHBoxLayout" name="parameterButtonsLayout">
+         <item>
+          <widget class="QPushButton" name="addParameterButton">
+           <property name="text">
+            <string>Add Parameter</string>
+           </property>
+          </widget>
+         </item>
+         <item>
+          <widget class="QPushButton" name="removeParameterButton">
+           <property name="text">
+            <string>Remove Parameter</string>
+           </property>
+          </widget>
+         </item>
+        </layout>
+       </item>
+      </layout>
+     </widget>
+     <widget class="QWidget" name="parameterDetailsPanel">
+      <layout class="QFormLayout" name="parameterDetailsForm">
+       <property name="verticalSpacing">
+        <number>3</number>
+       </property>
+       <item row="0" column="0">
+        <widget class="QLabel" name="nameLabel">
+         <property name="text">
+          <string>Name:</string>
+         </property>
+        </widget>
+       </item>
+       <item row="0" column="1">
+        <widget class="QLineEdit" name="nameEdit"/>
+       </item>
+       <item row="1" column="0">
+        <widget class="QLabel" name="typeLabel">
+         <property name="text">
+          <string>Type:</string>
+         </property>
+        </widget>
+       </item>
+       <item row="1" column="1">
+        <widget class="QComboBox" name="typeCombo">
+         <property name="editable">
+          <bool>true</bool>
+         </property>
+         <item>
+          <property name="text">
+           <string>real</string>
+          </property>
+         </item>
+         <item>
+          <property name="text">
+           <string>integer</string>
+          </property>
+         </item>
+         <item>
+          <property name="text">
+           <string>boolean</string>
+          </property>
+         </item>
+         <item>
+          <property name="text">
+           <string>string</string>
+          </property>
+         </item>
+        </widget>
+       </item>
+       <item row="2" column="0">
+        <widget class="QLabel" name="columnsLabel">
+         <property name="text">
+          <string>Matrix size:</string>
+         </property>
+        </widget>
+       </item>
+       <item row="2" column="1">
+        <layout class="QHBoxLayout" name="horizontalLayout">
+         <item>
+          <widget class="QSpinBox" name="columnsSpin">
+           <property name="minimum">
+            <number>1</number>
+           </property>
+           <property name="maximum">
+            <number>9999</number>
+           </property>
+          </widget>
+         </item>
+         <item>
+          <widget class="QSpinBox" name="rowsSpin">
+           <property name="minimum">
+            <number>1</number>
+           </property>
+           <property name="maximum">
+            <number>9999</number>
+           </property>
+          </widget>
+         </item>
+        </layout>
+       </item>
+       <item row="3" column="1">
+        <widget class="QLineEdit" name="valueEdit"/>
+       </item>
+       <item row="4" column="1">
+        <widget class="QComboBox" name="quantityCombo">
+         <property name="editable">
+          <bool>true</bool>
+         </property>
+        </widget>
+       </item>
+       <item row="5" column="1">
+        <widget class="QComboBox" name="unitCombo">
+         <property name="editable">
+          <bool>true</bool>
+         </property>
+        </widget>
+       </item>
+       <item row="6" column="1">
+        <widget class="QPlainTextEdit" name="descriptionEdit"/>
+       </item>
+       <item row="3" column="0">
+        <widget class="QLabel" name="valueLabel">
+         <property name="text">
+          <string>Value:</string>
+         </property>
+        </widget>
+       </item>
+       <item row="4" column="0">
+        <widget class="QLabel" name="quantityLabel">
+         <property name="text">
+          <string>Quantity:</string>
+         </property>
+        </widget>
+       </item>
+       <item row="5" column="0">
+        <widget class="QLabel" name="unitLabel">
+         <property name="text">
+          <string>Unit:</string>
+         </property>
+        </widget>
+       </item>
+       <item row="6" column="0">
+        <widget class="QLabel" name="descriptionLabel">
+         <property name="text">
+          <string>Description:</string>
+         </property>
+        </widget>
+       </item>
+      </layout>
+     </widget>
+    </widget>
+   </item>
+   <item>
+    <widget class="QDialogButtonBox" name="buttonBox">
+     <property name="standardButtons">
+      <set>QDialogButtonBox::StandardButton::Cancel|QDialogButtonBox::StandardButton::Ok</set>
+     </property>
+    </widget>
+   </item>
  </layout>
 </widget>
 <resources/>
- <connections><connection><sender>buttonBox</sender><signal>accepted()</signal><receiver>ParameterOptionsDialog</receiver><slot>accept()</slot><hints/></connection><connection><sender>buttonBox</sender><signal>rejected()</signal><receiver>ParameterOptionsDialog</receiver><slot>reject()</slot><hints/></connection></connections>
+ <connections>
+  <connection>
+   <sender>buttonBox</sender>
+   <signal>accepted()</signal>
+   <receiver>ParameterOptionsDialog</receiver>
+   <slot>accept()</slot>
+   <hints>
+    <hint type="sourcelabel">
+     <x>20</x>
+     <y>20</y>
+    </hint>
+    <hint type="destinationlabel">
+     <x>20</x>
+     <y>20</y>
+    </hint>
+   </hints>
+  </connection>
+  <connection>
+   <sender>buttonBox</sender>
+   <signal>rejected()</signal>
+   <receiver>ParameterOptionsDialog</receiver>
+   <slot>reject()</slot>
+   <hints>
+    <hint type="sourcelabel">
+     <x>20</x>
+     <y>20</y>
+    </hint>
+    <hint type="destinationlabel">
+     <x>20</x>
+     <y>20</y>
+    </hint>
+   </hints>
+  </connection>
+ </connections>
 </ui>
--- a/BEdit/ui/port_options_dialog.ui
+++ b/BEdit/ui/port_options_dialog.ui
@@ -2,43 +2,307 @@
 <ui version="4.0">
 <class>PortOptionsDialog</class>
 <widget class="QDialog" name="PortOptionsDialog">
-  <property name="geometry"><rect><x>0</x><y>0</y><width>620</width><height>380</height></rect></property>
-  <property name="windowTitle"><string>Port Options</string></property>
+  <property name="geometry">
+   <rect>
+    <x>0</x>
+    <y>0</y>
+    <width>760</width>
+    <height>421</height>
+   </rect>
+  </property>
+  <property name="windowTitle">
+   <string>Port Options</string>
+  </property>
  <layout class="QVBoxLayout" name="dialogLayout">
   <item>
    <widget class="QSplitter" name="portSplitter">
-     <property name="orientation"><enum>Qt::Orientation::Horizontal</enum></property>
+     <property name="orientation">
+      <enum>Qt::Orientation::Horizontal</enum>
+     </property>
     <widget class="QWidget" name="portListPanel">
      <layout class="QVBoxLayout" name="portListLayout">
-       <item><widget class="QListWidget" name="portList"/></item>
+       <item>
+        <widget class="QListWidget" name="portList"/>
+       </item>
       <item>
        <layout class="QHBoxLayout" name="portButtonsLayout">
-         <item><widget class="QPushButton" name="addPortButton"><property name="text"><string>Add Port</string></property></widget></item>
-         <item><widget class="QPushButton" name="removePortButton"><property name="text"><string>Remove Port</string></property></widget></item>
+         <item>
+          <widget class="QPushButton" name="addPortButton">
+           <property name="text">
+            <string>Add Port</string>
+           </property>
+          </widget>
+         </item>
+         <item>
+          <widget class="QPushButton" name="removePortButton">
+           <property name="text">
+            <string>Remove Port</string>
+           </property>
+          </widget>
+         </item>
        </layout>
       </item>
      </layout>
     </widget>
     <widget class="QWidget" name="portDetailsPanel">
      <layout class="QFormLayout" name="portDetailsForm">
-       <item row="0" column="0"><widget class="QLabel" name="nameLabel"><property name="text"><string>Name:</string></property></widget></item>
-       <item row="0" column="1"><widget class="QLineEdit" name="nameEdit"/></item>
-       <item row="1" column="0"><widget class="QLabel" name="typeLabel"><property name="text"><string>Type:</string></property></widget></item>
-       <item row="1" column="1"><widget class="QComboBox" name="typeCombo"><item><property name="text"><string>Signal</string></property></item></widget></item>
-       <item row="2" column="0"><widget class="QLabel" name="orientationLabel"><property name="text"><string>Orientation:</string></property></widget></item>
-       <item row="2" column="1"><widget class="QComboBox" name="orientationCombo"><item><property name="text"><string>Input</string></property></item><item><property name="text"><string>Output</string></property></item></widget></item>
-       <item row="3" column="0" colspan="2"><widget class="QCheckBox" name="multipleConnectionsCheckBox"><property name="text"><string>Allow multiple connections</string></property></widget></item>
-       <item row="4" column="0" colspan="2"><widget class="QLabel" name="positionHintLabel"><property name="text"><string>New ports start at (0, 0) in the icon editor.</string></property><property name="wordWrap"><bool>true</bool></property></widget></item>
+       <property name="verticalSpacing">
+        <number>3</number>
+       </property>
+       <item row="0" column="0">
+        <widget class="QLabel" name="nameLabel">
+         <property name="text">
+          <string>Name:</string>
+         </property>
+        </widget>
+       </item>
+       <item row="0" column="1">
+        <widget class="QLineEdit" name="nameEdit"/>
+       </item>
+       <item row="1" column="0">
+        <widget class="QLabel" name="typeLabel">
+         <property name="text">
+          <string>Port type:</string>
+         </property>
+        </widget>
+       </item>
+       <item row="1" column="1">
+        <widget class="QComboBox" name="typeCombo">
+         <item>
+          <property name="text">
+           <string>Signal</string>
+          </property>
+         </item>
+        </widget>
+       </item>
+       <item row="2" column="0">
+        <widget class="QLabel" name="orientationLabel">
+         <property name="text">
+          <string>Orientation:</string>
+         </property>
+        </widget>
+       </item>
+       <item row="2" column="1">
+        <widget class="QComboBox" name="orientationCombo">
+         <item>
+          <property name="text">
+           <string>Input</string>
+          </property>
+         </item>
+         <item>
+          <property name="text">
+           <string>Output</string>
+          </property>
+         </item>
+         <item>
+          <property name="text">
+           <string>Indifferent</string>
+          </property>
+         </item>
+        </widget>
+       </item>
+       <item row="3" column="0" colspan="2">
+        <widget class="QCheckBox" name="multipleConnectionsCheckBox">
+         <property name="text">
+          <string>Allow multiple connections</string>
+         </property>
+        </widget>
+       </item>
+       <item row="5" column="0" colspan="2">
+        <widget class="QLabel" name="positionHintLabel">
+         <property name="text">
+          <string>New ports start at (0, 0) in the icon editor.</string>
+         </property>
+         <property name="wordWrap">
+          <bool>true</bool>
+         </property>
+        </widget>
+       </item>
+       <item row="4" column="0" colspan="2">
+        <widget class="QStackedWidget" name="typeOptionsStack">
+         <widget class="QWidget" name="signalOptionsPage">
+          <layout class="QFormLayout" name="signalOptionsForm">
+           <item row="0" column="0">
+            <widget class="QLabel" name="valueTypeLabel">
+             <property name="text">
+              <string>Type:</string>
+             </property>
+            </widget>
+           </item>
+           <item row="0" column="1">
+            <widget class="QComboBox" name="valueTypeCombo">
+             <property name="editable">
+              <bool>true</bool>
+             </property>
+             <item>
+              <property name="text">
+               <string>real</string>
+              </property>
+             </item>
+             <item>
+              <property name="text">
+               <string>integer</string>
+              </property>
+             </item>
+             <item>
+              <property name="text">
+               <string>boolean</string>
+              </property>
+             </item>
+             <item>
+              <property name="text">
+               <string>string</string>
+              </property>
+             </item>
+            </widget>
+           </item>
+           <item row="1" column="0">
+            <widget class="QLabel" name="quantityLabel">
+             <property name="text">
+              <string>Quantity:</string>
+             </property>
+            </widget>
+           </item>
+           <item row="1" column="1">
+            <widget class="QComboBox" name="quantityCombo">
+             <property name="editable">
+              <bool>true</bool>
+             </property>
+            </widget>
+           </item>
+           <item row="2" column="1">
+            <widget class="QComboBox" name="unitCombo">
+             <property name="editable">
+              <bool>true</bool>
+             </property>
+            </widget>
+           </item>
+           <item row="2" column="0">
+            <widget class="QLabel" name="unitLabel">
+             <property name="text">
+              <string>Unit:</string>
+             </property>
+            </widget>
+           </item>
+           <item row="3" column="0">
+            <widget class="QLabel" name="rowsColumnsLabel">
+             <property name="text">
+              <string>Matrix size:</string>
+             </property>
+            </widget>
+           </item>
+           <item row="3" column="1">
+            <layout class="QHBoxLayout" name="horizontalLayout">
+             <item>
+              <widget class="QSpinBox" name="rowsSpin">
+               <property name="minimum">
+                <number>1</number>
+               </property>
+               <property name="maximum">
+                <number>9999</number>
+               </property>
+              </widget>
+             </item>
+             <item>
+              <widget class="QSpinBox" name="columnsSpin">
+               <property name="minimum">
+                <number>1</number>
+               </property>
+               <property name="maximum">
+                <number>9999</number>
+               </property>
+              </widget>
+             </item>
+            </layout>
+           </item>
+           <item row="4" column="0">
+            <widget class="QLabel" name="descriptionLabel">
+             <property name="text">
+              <string>Description:</string>
+             </property>
+            </widget>
+           </item>
+           <item row="4" column="1">
+            <widget class="QPlainTextEdit" name="descriptionEdit"/>
+           </item>
+          </layout>
+         </widget>
+         <widget class="QWidget" name="powerOptionsPage">
+          <layout class="QFormLayout" name="powerOptionsForm">
+           <item row="0" column="0"><widget class="QLabel" name="domainLabel"><property name="text"><string>Domain:</string></property></widget></item>
+           <item row="0" column="1"><widget class="QComboBox" name="domainCombo"/></item>
+           <item row="1" column="0"><widget class="QLabel" name="effortLabel"><property name="text"><string>Effort:</string></property></widget></item>
+           <item row="1" column="1"><widget class="QLabel" name="effortValueLabel"><property name="text"><string>p.e</string></property></widget></item>
+           <item row="2" column="0"><widget class="QLabel" name="flowLabel"><property name="text"><string>Flow:</string></property></widget></item>
+           <item row="2" column="1"><widget class="QLabel" name="flowValueLabel"><property name="text"><string>p.f</string></property></widget></item>
+           <item row="3" column="0"><widget class="QLabel" name="causalityLabel"><property name="text"><string>Causality:</string></property></widget></item>
+           <item row="3" column="1"><widget class="QComboBox" name="causalityCombo"/></item>
+           <item row="4" column="0"><widget class="QLabel" name="powerDescriptionLabel"><property name="text"><string>Description:</string></property></widget></item>
+           <item row="4" column="1"><widget class="QPlainTextEdit" name="powerDescriptionEdit"/></item>
+          </layout>
+         </widget>
+         <widget class="QWidget" name="unsupportedTypePage">
+          <layout class="QVBoxLayout" name="unsupportedTypeLayout">
+           <item>
+            <widget class="QLabel" name="unsupportedTypeLabel">
+             <property name="text">
+              <string>This port type does not have an options editor yet.</string>
+             </property>
+             <property name="wordWrap">
+              <bool>true</bool>
+             </property>
+            </widget>
+           </item>
+          </layout>
+         </widget>
+        </widget>
+       </item>
      </layout>
     </widget>
    </widget>
   </item>
-   <item><widget class="QDialogButtonBox" name="buttonBox"><property name="standardButtons"><set>QDialogButtonBox::StandardButton::Cancel|QDialogButtonBox::StandardButton::Ok</set></property></widget></item>
+   <item>
+    <widget class="QDialogButtonBox" name="buttonBox">
+     <property name="standardButtons">
+      <set>QDialogButtonBox::StandardButton::Cancel|QDialogButtonBox::StandardButton::Ok</set>
+     </property>
+    </widget>
+   </item>
  </layout>
 </widget>
 <resources/>
 <connections>
-  <connection><sender>buttonBox</sender><signal>accepted()</signal><receiver>PortOptionsDialog</receiver><slot>accept()</slot><hints/></connection>
-  <connection><sender>buttonBox</sender><signal>rejected()</signal><receiver>PortOptionsDialog</receiver><slot>reject()</slot><hints/></connection>
+  <connection>
+   <sender>buttonBox</sender>
+   <signal>accepted()</signal>
+   <receiver>PortOptionsDialog</receiver>
+   <slot>accept()</slot>
+   <hints>
+    <hint type="sourcelabel">
+     <x>20</x>
+     <y>20</y>
+    </hint>
+    <hint type="destinationlabel">
+     <x>20</x>
+     <y>20</y>
+    </hint>
+   </hints>
+  </connection>
+  <connection>
+   <sender>buttonBox</sender>
+   <signal>rejected()</signal>
+   <receiver>PortOptionsDialog</receiver>
+   <slot>reject()</slot>
+   <hints>
+    <hint type="sourcelabel">
+     <x>20</x>
+     <y>20</y>
+    </hint>
+    <hint type="destinationlabel">
+     <x>20</x>
+     <y>20</y>
+    </hint>
+   </hints>
+  </connection>
 </connections>
 </ui>
--- a/BEdit/ui/settings_dialog.ui
+++ b/BEdit/ui/settings_dialog.ui
@@ -86,6 +86,55 @@
       </item>
      </layout>
     </widget>
+     <widget class="QWidget" name="bondGraphTab">
+      <attribute name="title">
+       <string>Bond graph</string>
+      </attribute>
+      <layout class="QVBoxLayout" name="bondGraphLayout">
+       <item>
+        <widget class="QGroupBox" name="causalityGroupBox">
+         <property name="title">
+          <string>Causality</string>
+         </property>
+         <layout class="QVBoxLayout" name="causalityLayout">
+          <item>
+           <widget class="QCheckBox" name="automaticCausalityCheckBox">
+            <property name="text">
+             <string>Infer causality when connections are added or removed</string>
+            </property>
+            <property name="checked">
+             <bool>true</bool>
+            </property>
+           </widget>
+          </item>
+          <item>
+           <widget class="QLabel" name="automaticCausalityHintLabel">
+            <property name="text">
+             <string>When disabled, displayed causalities are updated only when compiling, exporting, or running the model.</string>
+            </property>
+            <property name="wordWrap">
+             <bool>true</bool>
+            </property>
+           </widget>
+          </item>
+         </layout>
+        </widget>
+       </item>
+       <item>
+        <spacer name="bondGraphSpacer">
+         <property name="orientation">
+          <enum>Qt::Orientation::Vertical</enum>
+         </property>
+         <property name="sizeHint" stdset="0">
+          <size>
+           <width>20</width>
+           <height>40</height>
+          </size>
+         </property>
+        </spacer>
+       </item>
+      </layout>
+     </widget>
     <widget class="QWidget" name="simulationTab">
      <attribute name="title"><string>Simulation</string></attribute>
      <layout class="QVBoxLayout" name="simulationTabLayout">
--- a/BEdit/ui/simulation_window.ui
+++ b/BEdit/ui/simulation_window.ui
@@ -20,12 +20,12 @@
  <widget class="QWidget" name="centralWidget">
   <layout class="QVBoxLayout" name="resultsLayout">
    <item>
-     <widget class="QLabel" name="resultsPlaceholder">
-      <property name="text">
-       <string>Simulation graphs and result controls can be added here.</string>
+     <widget class="QTabWidget" name="graphTabs">
+      <property name="tabsClosable">
+       <bool>false</bool>
      </property>
-      <property name="alignment">
-       <set>Qt::AlignmentFlag::AlignCenter</set>
+      <property name="movable">
+       <bool>true</bool>
      </property>
     </widget>
    </item>
@@ -76,10 +76,34 @@
    <addaction name="actionAbout"/>
    <addaction name="actionAboutQt"/>
   </widget>
+   <widget class="QMenu" name="menuGraph">
+    <property name="title">
+     <string>&amp;Graph</string>
+    </property>
+    <addaction name="actionAddGraph"/>
+    <addaction name="actionRemoveGraph"/>
+   </widget>
   <addaction name="menuFile"/>
   <addaction name="menuView"/>
+   <addaction name="menuGraph"/>
   <addaction name="menuHelp"/>
  </widget>
+  <widget class="QToolBar" name="workspaceToolbar">
+   <property name="windowTitle">
+    <string>Workspace</string>
+   </property>
+   <property name="toolButtonStyle">
+    <enum>Qt::ToolButtonStyle::ToolButtonIconOnly</enum>
+   </property>
+   <attribute name="toolBarArea">
+    <enum>TopToolBarArea</enum>
+   </attribute>
+   <attribute name="toolBarBreak">
+    <bool>false</bool>
+   </attribute>
+   <addaction name="actionAddGraph"/>
+   <addaction name="actionRemoveGraph"/>
+  </widget>
  <widget class="QToolBar" name="fileToolbar">
   <property name="windowTitle">
    <string>File</string>
@@ -93,10 +117,10 @@
   <attribute name="toolBarBreak">
    <bool>false</bool>
   </attribute>
+   <addaction name="actionClear"/>
   <addaction name="actionOpen"/>
   <addaction name="actionSave"/>
   <addaction name="actionSaveAs"/>
-   <addaction name="actionClear"/>
  </widget>
  <widget class="QDockWidget" name="statusDock">
   <property name="windowTitle">
@@ -162,6 +186,36 @@
    </layout>
   </widget>
  </widget>
+  <widget class="QDockWidget" name="signalsDock">
+   <property name="windowTitle">
+    <string>Signals</string>
+   </property>
+   <attribute name="dockWidgetArea">
+    <number>2</number>
+   </attribute>
+   <widget class="QWidget" name="signalsDockContents">
+    <layout class="QVBoxLayout" name="signalsLayout">
+     <item>
+      <widget class="QTreeWidget" name="signalsTree">
+       <property name="contextMenuPolicy">
+        <enum>Qt::ContextMenuPolicy::CustomContextMenu</enum>
+       </property>
+       <property name="selectionMode">
+        <enum>QAbstractItemView::SelectionMode::ExtendedSelection</enum>
+       </property>
+       <property name="headerHidden">
+        <bool>true</bool>
+       </property>
+       <column>
+        <property name="text">
+         <string>Signal</string>
+        </property>
+       </column>
+      </widget>
+     </item>
+    </layout>
+   </widget>
+  </widget>
  <action name="actionOpen">
   <property name="icon">
    <iconset resource="../resources/resources.qrc">
@@ -236,6 +290,30 @@
    <string>Results</string>
   </property>
  </action>
+  <action name="actionAddGraph">
+   <property name="icon">
+    <iconset resource="../resources/resources.qrc">
+     <normaloff>:/icons/icons/list-add.png</normaloff>:/icons/icons/list-add.png</iconset>
+   </property>
+   <property name="text">
+    <string>Add Graph</string>
+   </property>
+   <property name="statusTip">
+    <string>Add a graph workspace tab</string>
+   </property>
+  </action>
+  <action name="actionRemoveGraph">
+   <property name="icon">
+    <iconset resource="../resources/resources.qrc">
+     <normaloff>:/icons/icons/list-remove.png</normaloff>:/icons/icons/list-remove.png</iconset>
+   </property>
+   <property name="text">
+    <string>Remove Current Graph</string>
+   </property>
+   <property name="statusTip">
+    <string>Remove the current graph workspace tab</string>
+   </property>
+  </action>
 </widget>
 <resources>
  <include location="../resources/resources.qrc"/>
--- a/BEdit/ui/text_definition_editor.ui
+++ b/BEdit/ui/text_definition_editor.ui
@@ -12,11 +12,27 @@
    <widget class="QSplitter" name="columnSplitter">
     <property name="orientation"><enum>Qt::Orientation::Horizontal</enum></property>
     <property name="childrenCollapsible"><bool>false</bool></property>
-     <widget class="QGroupBox" name="equationsGroup">
-      <property name="title"><string>Equations</string></property>
-      <layout class="QVBoxLayout" name="equationsLayout">
-       <item><widget class="OpenModelicaEditor" name="equationsEdit"/></item>
-      </layout>
+     <widget class="QSplitter" name="sourceSplitter">
+      <property name="orientation"><enum>Qt::Orientation::Vertical</enum></property>
+      <property name="childrenCollapsible"><bool>false</bool></property>
+      <widget class="QGroupBox" name="declarationsGroup">
+       <property name="title"><string>Declarations</string></property>
+       <layout class="QVBoxLayout" name="declarationsLayout">
+        <item><widget class="OpenModelicaEditor" name="declarationsEdit"/></item>
+       </layout>
+      </widget>
+      <widget class="QGroupBox" name="initialEquationsGroup">
+       <property name="title"><string>Initial Equations</string></property>
+       <layout class="QVBoxLayout" name="initialEquationsLayout">
+        <item><widget class="OpenModelicaEditor" name="initialEquationsEdit"/></item>
+       </layout>
+      </widget>
+      <widget class="QGroupBox" name="equationsGroup">
+       <property name="title"><string>Equations</string></property>
+       <layout class="QVBoxLayout" name="equationsLayout">
+        <item><widget class="OpenModelicaEditor" name="equationsEdit"/></item>
+       </layout>
+      </widget>
     </widget>
     <widget class="QSplitter" name="definitionSplitter">
      <property name="orientation"><enum>Qt::Orientation::Vertical</enum></property>
@@ -24,15 +40,13 @@
      <widget class="QGroupBox" name="portsGroup">
       <property name="title"><string>Ports</string></property>
       <layout class="QVBoxLayout" name="portsLayout">
-        <item><widget class="QTableWidget" name="portsTable"><property name="selectionBehavior"><enum>QAbstractItemView::SelectionBehavior::SelectRows</enum></property><property name="selectionMode"><enum>QAbstractItemView::SelectionMode::SingleSelection</enum></property><property name="columnCount"><number>4</number></property><column><property name="text"><string>Name</string></property></column><column><property name="text"><string>Type</string></property></column><column><property name="text"><string>Orientation</string></property></column><column><property name="text"><string>Multiple</string></property></column></widget></item>
-        <item><layout class="QHBoxLayout" name="portButtonsLayout"><item><widget class="QPushButton" name="addPortButton"><property name="text"><string>Add Port</string></property></widget></item><item><widget class="QPushButton" name="removePortButton"><property name="text"><string>Remove Port</string></property></widget></item><item><spacer name="portButtonSpacer"><property name="orientation"><enum>Qt::Orientation::Horizontal</enum></property><property name="sizeHint" stdset="0"><size><width>40</width><height>20</height></size></property></spacer></item></layout></item>
+        <item><widget class="PortEditor" name="portEditor"/></item>
       </layout>
      </widget>
      <widget class="QGroupBox" name="parametersGroup">
       <property name="title"><string>Parameters</string></property>
       <layout class="QVBoxLayout" name="parametersLayout">
-        <item><widget class="QTableWidget" name="parametersTable"><property name="selectionBehavior"><enum>QAbstractItemView::SelectionBehavior::SelectRows</enum></property><property name="selectionMode"><enum>QAbstractItemView::SelectionMode::SingleSelection</enum></property><property name="columnCount"><number>3</number></property><column><property name="text"><string>Name</string></property></column><column><property name="text"><string>Type</string></property></column><column><property name="text"><string>Value</string></property></column></widget></item>
-        <item><layout class="QHBoxLayout" name="parameterButtonsLayout"><item><widget class="QPushButton" name="addParameterButton"><property name="text"><string>Add Parameter</string></property></widget></item><item><widget class="QPushButton" name="removeParameterButton"><property name="text"><string>Remove Parameter</string></property></widget></item><item><spacer name="parameterButtonSpacer"><property name="orientation"><enum>Qt::Orientation::Horizontal</enum></property><property name="sizeHint" stdset="0"><size><width>40</width><height>20</height></size></property></spacer></item></layout></item>
+        <item><widget class="ParameterEditor" name="parameterEditor"/></item>
       </layout>
      </widget>
     </widget>
@@ -46,6 +60,8 @@
   <extends>QPlainTextEdit</extends>
   <header>bedit.gui.editors.openmodelica</header>
  </customwidget>
+  <customwidget><class>PortEditor</class><extends>QWidget</extends><header>bedit.gui.dialogs.port_options</header></customwidget>
+  <customwidget><class>ParameterEditor</class><extends>QWidget</extends><header>bedit.gui.dialogs.parameter_options</header></customwidget>
 </customwidgets>
 <resources/>
 <connections/>
--- a/BEdit/untitled.bedit.json
+++ b/BEdit/untitled.bedit.json
--- a/m_Test.mo
+++ b/m_Test.mo
@@ -6,7 +6,7 @@ model m_Test
 		y = v;
 	end m_Constant0;
 	model m_gain0
-		input Real u;
+		input Real u(quantity="Velocity", unit="m/s");
 		output Real y;
 		parameter Real k = 2.5;
 	equation
@@ -16,7 +16,7 @@ model m_Test
 		output Real y;
 		parameter Real v = 4.8;
 	equation
-		y = v+sin(time);
+		y = v+sin(10*time);
 	end m_const_and_time;
 	model m_gain1
 		input Real u;
@@ -31,14 +31,43 @@ model m_Test
 	equation
 		y = sum(u[i] for i in 1:2 );
 	end m_add0;
+	model m_Integrate0
+		input Real u;
+		output Real y;
+		parameter Real y_start = 0;
+	initial equation
+		y = y_start;
+	equation
+		der(y) = u;
+	end m_Integrate0;
+	model m_Differentiate0
+		input Real u;
+		output Real y;
+		parameter Real x_start = 0;
+		parameter Real y_start = 0;
+		parameter Real k = 1;
+		parameter Real T = 0.01;
+		Real x(start=x_start);
+	initial equation
+		y = y_start;
+	equation
+		assert(T > 0, "Differentiate time constant T must be positive");
+
+		der(x) = (u - x)/T;
+		y = (k/T)*(u - x);
+	end m_Differentiate0;
 	m_Constant0 Constant0;
 	m_gain0 gain0;
 	m_const_and_time const_and_time;
 	m_gain1 gain1;
 	m_add0 add0;
+	m_Integrate0 Integrate0;
+	m_Differentiate0 Differentiate0;
 equation
 	gain0.u = Constant0.y;
 	gain1.u = const_and_time.y;
 	add0.u[1] = gain0.y;
 	add0.u[2] = gain1.y;
-end m_Test;
+	Integrate0.u = add0.y;
+	Differentiate0.u = add0.y;
+end m_Test;
Author	SHA1	Message	Date
Joppe Blondel	8a6203d01e	Fixed some bugs	2026-07-22 19:16:56 +02:00
Joppe Blondel	2d49f65ec4	Fixed some bugs	2026-07-22 18:13:13 +02:00
Joppe Blondel	c918a6a428	causality inference done	2026-07-22 18:04:07 +02:00
Joppe Blondel	32154386e8	Start with causality inference	2026-07-22 13:20:49 +02:00
Joppe Blondel	09248421d0	Bond graph ports and drawing added	2026-07-22 12:24:58 +02:00
Joppe Blondel	0c578af85d	port and param editor in and outside of text editor the same	2026-07-22 11:45:43 +02:00
Joppe Blondel	edefb23edc	More types and units	2026-07-22 11:38:07 +02:00
Joppe Blondel	48ac9e2f59	proper modelica text model editing	2026-07-21 17:16:06 +02:00
Joppe Blondel	2f6487e510	Added direct graph navigation without activating Matplotlib toolbar modes: Mouse wheel zooms in and out around the cursor. Left-click dragging pans the graph. Matplotlib toolbar modes still work and take precedence when activated. The existing Home button can reset the view.	2026-07-21 15:29:58 +02:00
Joppe Blondel	eb8f77ce64	better signal graphing	2026-07-21 15:24:24 +02:00
Joppe Blondel	35d933ccbb	Added signal graphing	2026-07-21 15:14:12 +02:00