eclipse-syson · AxelRICHARD · Jun 26, 2026 · Jun 22, 2026
diff --git a/CHANGELOG.adoc b/CHANGELOG.adoc
@@ -73,6 +73,7 @@ It leverages the selection dialog to either create an _occurrence timeslice/snap
 - https://github.com/eclipse-syson/syson/issues/2254[#2254] [diagrams] Add the support for _assume_ and _require_ graphical edges.
 - https://github.com/eclipse-syson/syson/issues/2260[#2260] [diagrams] Add the _New Assume Constraint_ or _New Require Constraint_ edge tools to create _assume_ and _require_ graphical edges.
 - https://github.com/eclipse-syson/syson/issues/2113[#2113] [diagrams] Handle start/end/merge/decision... graphical nodes on Action Flow View diagram background
+- https://github.com/eclipse-syson/syson/issues/2303[#2303] [diagrams] Add support for list item inheritance in _states_ and _exhibit states_ compartments
 
 == v2026.5.0
 

diff --git a/...yson/application/controllers/diagrams/general/view/GVCompartmentItemInheritanceTests.java b/...yson/application/controllers/diagrams/general/view/GVCompartmentItemInheritanceTests.java
diff --git a/.../test/java/org/eclipse/syson/application/data/GeneralViewWithTopNodesTestProjectData.java b/.../test/java/org/eclipse/syson/application/data/GeneralViewWithTopNodesTestProjectData.java
@@ -64,6 +64,8 @@ public static class GraphicalIds {
 
         public static final String REQUIREMENT_USAGE_ID = "3eea9d01-7033-3f31-b7ef-561b5bc86d10";
 
+        public static final String STATE_DEFINITION_ID = "dbf7eccb-35e6-3ff1-b7b8-fc71f1a4094a";
+
         public static final String STATE_USAGE_ID = "1541c013-2cc7-3dd7-a39f-6e33d07b411e";
     }
 

diff --git a/backend/tests/syson-tests/src/test/java/org/eclipse/syson/tests/GeneralPurposeTests.java b/backend/tests/syson-tests/src/test/java/org/eclipse/syson/tests/GeneralPurposeTests.java
@@ -117,6 +117,10 @@ public class GeneralPurposeTests {
             "/org/eclipse/syson/direct/edit/grammars"
     );
 
+    private static final List<String> CHECKSTYLE_HIDDEN_FIELD_WHITELIST_CLASSNAME = List.of(
+            "ElementSpecializationInheritanceTestRunner"
+    );
+
     /**
      * Finds the folder containing the Git repository.
      *
@@ -216,7 +220,7 @@ private void testNoSuppressWarnings(int index, String line, Path javaFilePath, L
             if (line.contains(CHECKSTYLE_HIDDEN_FIELD)) {
                 isValidUsage = true;
                 isValidUsage = isValidUsage && lines.size() > index;
-                isValidUsage = isValidUsage && lines.get(index + 1).contains(BUILDER);
+                isValidUsage = isValidUsage && (lines.get(index + 1).contains(BUILDER) || CHECKSTYLE_HIDDEN_FIELD_WHITELIST_CLASSNAME.stream().anyMatch(whiteListClassName -> lines.get(index + 1).contains(whiteListClassName)));
             } else if (line.contains(CHECKSTYLE_ILLEGAL_CATCH)) {
                 isValidUsage = true;
             } else if (line.contains(CHECKSTYLE_MULTIPLE_STRING_LITERALS)) {
@@ -237,8 +241,7 @@ private void testNoSuppressWarnings(int index, String line, Path javaFilePath, L
     private void testNoCheckstyleOff(int index, String line, Path javaFilePath) {
         var whitelist = Stream.of(
                 Path.of("ServiceMethod.java"),
-                Path.of("GVTopNodeCreationTests.java"),
-                Path.of("GVCompartmentItemInheritanceTests.java")
+                Path.of("GVTopNodeCreationTests.java")
         );
         if (whitelist.filter(javaFilePath::endsWith).findFirst().isEmpty()) {
             if (line.contains(CHECKSTYLE_OFF)) {

diff --git a/...iagram/common/view/nodes/ExhibitStateInheritedCompartmentItemNodeDescriptionProvider.java b/...iagram/common/view/nodes/ExhibitStateInheritedCompartmentItemNodeDescriptionProvider.java
@@ -0,0 +1,44 @@
+/*******************************************************************************
+ * Copyright (c) 2026 Obeo.
+ * This program and the accompanying materials
+ * are made available under the terms of the Eclipse Public License v2.0
+ * which accompanies this distribution, and is available at
+ * https://www.eclipse.org/legal/epl-2.0/
+ *
+ * SPDX-License-Identifier: EPL-2.0
+ *
+ * Contributors:
+ *     Obeo - initial API and implementation
+ *******************************************************************************/
+package org.eclipse.syson.diagram.common.view.nodes;
+
+import org.eclipse.emf.ecore.EClass;
+import org.eclipse.emf.ecore.EReference;
+import org.eclipse.sirius.components.view.builder.providers.IColorProvider;
+import org.eclipse.sirius.components.view.diagram.NodeDescription;
+import org.eclipse.syson.sysml.SysmlPackage;
+import org.eclipse.syson.util.AQLConstants;
+import org.eclipse.syson.util.IDescriptionNameGenerator;
+import org.eclipse.syson.util.SysMLMetamodelHelper;
+
+/**
+ * The inherited exhibit state compartment list item node description provider.
+ *
+ * @author gcoutable
+ */
+public class ExhibitStateInheritedCompartmentItemNodeDescriptionProvider extends InheritedCompartmentItemNodeDescriptionProvider {
+
+    public ExhibitStateInheritedCompartmentItemNodeDescriptionProvider(EClass eClass, EReference eReference, IColorProvider colorProvider, IDescriptionNameGenerator descriptionNameGenerator) {
+        super(eClass, eReference, colorProvider, descriptionNameGenerator);
+    }
+
+    @Override
+    public NodeDescription create() {
+        NodeDescription nd = super.create();
+        var qualifiedName = SysMLMetamodelHelper.buildQualifiedName(SysmlPackage.eINSTANCE.getExhibitStateUsage());
+        nd.setName(this.descriptionNameGenerator.getInheritedCompartmentItemName(this.eClass, this.eReference) + StatesCompartmentNodeDescriptionProvider.EXHIBIT_STATES_NAME);
+        nd.setDomainType(qualifiedName);
+        nd.setPreconditionExpression(AQLConstants.AQL_SELF + ".oclIsTypeOf(" + qualifiedName + ")");
+        return nd;
+    }
+}
diff --git a/...ipse/syson/diagram/common/view/nodes/InheritedCompartmentItemNodeDescriptionProvider.java b/...ipse/syson/diagram/common/view/nodes/InheritedCompartmentItemNodeDescriptionProvider.java
@@ -45,11 +45,11 @@
  */
 public class InheritedCompartmentItemNodeDescriptionProvider extends AbstractNodeDescriptionProvider {
 
-    private final EClass eClass;
+    protected final EClass eClass;
 
-    private final EReference eReference;
+    protected final EReference eReference;
 
-    private final IDescriptionNameGenerator descriptionNameGenerator;
+    protected final IDescriptionNameGenerator descriptionNameGenerator;
 
     public InheritedCompartmentItemNodeDescriptionProvider(EClass eClass, EReference eReference, IColorProvider colorProvider, IDescriptionNameGenerator descriptionNameGenerator) {
         super(colorProvider);

diff --git a/...org/eclipse/syson/diagram/common/view/nodes/StatesCompartmentNodeDescriptionProvider.java b/...org/eclipse/syson/diagram/common/view/nodes/StatesCompartmentNodeDescriptionProvider.java
@@ -82,11 +82,13 @@ public void link(DiagramDescription diagramDescription, IViewDiagramElementFinde
         if (this.showsExhibitOnly) {
             cache.getNodeDescription(this.getDescriptionNameGenerator().getCompartmentName(this.eClass, this.eReference) + EXHIBIT_STATES_NAME).ifPresent(nd -> {
                 cache.getNodeDescription(this.getDescriptionNameGenerator().getCompartmentItemName(this.eClass, this.eReference) + EXHIBIT_STATES_NAME).ifPresent(nd.getChildrenDescriptions()::add);
+                cache.getNodeDescription(this.getDescriptionNameGenerator().getInheritedCompartmentItemName(this.eClass, eReference) + EXHIBIT_STATES_NAME).ifPresent(nd.getChildrenDescriptions()::add);
                 nd.setPalette(this.createCompartmentPalette(cache));
             });
         } else {
             cache.getNodeDescription(this.getDescriptionNameGenerator().getCompartmentName(this.eClass, this.eReference) + STATES_NAME).ifPresent(nd -> {
                 cache.getNodeDescription(this.getDescriptionNameGenerator().getCompartmentItemName(this.eClass, this.eReference) + STATES_NAME).ifPresent(nd.getChildrenDescriptions()::add);
+                cache.getNodeDescription(this.getDescriptionNameGenerator().getInheritedCompartmentItemName(this.eClass, eReference)).ifPresent(nd.getChildrenDescriptions()::add);
                 nd.setPalette(this.createCompartmentPalette(cache));
             });
         }

diff --git a/.../org/eclipse/syson/diagram/common/view/services/InheritedCompartmentItemFilterSwitch.java b/.../org/eclipse/syson/diagram/common/view/services/InheritedCompartmentItemFilterSwitch.java
@@ -21,15 +21,19 @@
 import org.eclipse.emf.ecore.EReference;
 import org.eclipse.syson.sysml.Behavior;
 import org.eclipse.syson.sysml.ConstraintUsage;
+import org.eclipse.syson.sysml.Definition;
+import org.eclipse.syson.sysml.ExhibitStateUsage;
 import org.eclipse.syson.sysml.Feature;
 import org.eclipse.syson.sysml.OwningMembership;
 import org.eclipse.syson.sysml.PartUsage;
 import org.eclipse.syson.sysml.ReferenceUsage;
 import org.eclipse.syson.sysml.RequirementConstraintKind;
 import org.eclipse.syson.sysml.RequirementConstraintMembership;
+import org.eclipse.syson.sysml.StateUsage;
 import org.eclipse.syson.sysml.Step;
 import org.eclipse.syson.sysml.SysmlPackage;
 import org.eclipse.syson.sysml.Type;
+import org.eclipse.syson.sysml.Usage;
 import org.eclipse.syson.sysml.util.SysmlSwitch;
 
 /**
@@ -50,17 +54,6 @@ public Boolean defaultCase(EObject object) {
         return false;
     }
 
-    @Override
-    public Boolean caseFeature(Feature object) {
-        // Add this behavior parameter check for each caseXXXUsage.
-        // In this case, we want to display inherited parameters (directed feature) but not all features with the same
-        // type.
-        if (this.shouldConsiderParameter(object)) {
-            return this.isInheritedParameter(object);
-        }
-        return this.eReference.getEType().equals(object.eClass());
-    }
-
     @Override
     public Boolean caseConstraintUsage(ConstraintUsage object) {
         boolean keep = true;
@@ -80,6 +73,35 @@ public Boolean caseConstraintUsage(ConstraintUsage object) {
         return keep && this.caseFeature(object);
     }
 
+    @Override
+    public Boolean caseExhibitStateUsage(ExhibitStateUsage object) {
+        Boolean shouldKeep = Boolean.FALSE;
+        // Add this behavior parameter check for each caseXXXUsage.
+        // In this case, we want to display inherited parameters (directed feature) but not all features with the same
+        // type.
+        if (!shouldKeep && this.shouldConsiderParameter(object)) {
+            shouldKeep = this.isInheritedParameter(object);
+        }
+        if (!shouldKeep && this.shouldConsiderExhibitState(object)) {
+            shouldKeep = this.isInheritedState(object);
+        }
+        if (!shouldKeep) {
+            shouldKeep = super.caseExhibitStateUsage(object);
+        }
+        return shouldKeep;
+    }
+
+    @Override
+    public Boolean caseFeature(Feature object) {
+        // Add this behavior parameter check for each caseXXXUsage.
+        // In this case, we want to display inherited parameters (directed feature) but not all features with the same
+        // type.
+        if (this.shouldConsiderParameter(object)) {
+            return this.isInheritedParameter(object);
+        }
+        return this.eReference.getEType().equals(object.eClass());
+    }
+
     @Override
     public Boolean casePartUsage(PartUsage object) {
         // Add this behavior parameter check for each caseXXXUsage.
@@ -121,4 +143,23 @@ private boolean isInheritedParameter(Feature feature) {
         };
         return featureParameter.contains(feature);
     }
+
+    private boolean shouldConsiderExhibitState(Feature feature) {
+        if (!(feature instanceof ExhibitStateUsage)) {
+            return false;
+        }
+
+        EClassifier eType = this.eReference.getEType();
+        EClass eClass = feature.eClass();
+        return eType.equals(eClass) || (eType instanceof EClass eTypeEClass && eTypeEClass.isSuperTypeOf(eClass));
+    }
+
+    private boolean isInheritedState(Feature feature) {
+        List<StateUsage> featureState = switch (feature.getOwner()) {
+            case Definition definition -> definition.getOwnedState();
+            case Usage usage -> usage.getNestedState();
+            default -> List.of();
+        };
+        return featureState.contains(feature);
+    }
 }
diff --git a/...src/main/java/org/eclipse/syson/standard/diagrams/view/SDVDiagramDescriptionProvider.java b/...src/main/java/org/eclipse/syson/standard/diagrams/view/SDVDiagramDescriptionProvider.java
@@ -53,6 +53,7 @@
 import org.eclipse.syson.diagram.common.view.nodes.DecisionActionNodeDescriptionProvider;
 import org.eclipse.syson.diagram.common.view.nodes.DoneActionNodeDescriptionProvider;
 import org.eclipse.syson.diagram.common.view.nodes.DoneStateNodeDescriptionProvider;
+import org.eclipse.syson.diagram.common.view.nodes.ExhibitStateInheritedCompartmentItemNodeDescriptionProvider;
 import org.eclipse.syson.diagram.common.view.nodes.ForkActionNodeDescriptionProvider;
 import org.eclipse.syson.diagram.common.view.nodes.FramedConcernCompartmentItemNodeDescription;
 import org.eclipse.syson.diagram.common.view.nodes.FramedConcernCompartmentNodeDescription;
@@ -617,16 +618,22 @@ private List<IDiagramElementDescriptionProvider<?>> createCompartmentsForListIte
                     compartmentNodeDescriptionProviders.add(new StatesCompartmentItemNodeDescriptionProvider(eClass, eReference, colorProvider, this.getDescriptionNameGenerator(), true));
                     compartmentNodeDescriptionProviders.add(new StatesCompartmentNodeDescriptionProvider(eClass, eReference, colorProvider, this.getDescriptionNameGenerator(), false));
                     compartmentNodeDescriptionProviders.add(new StatesCompartmentItemNodeDescriptionProvider(eClass, eReference, colorProvider, this.getDescriptionNameGenerator(), false));
+                    compartmentNodeDescriptionProviders.add(new InheritedCompartmentItemNodeDescriptionProvider(eClass, eReference, colorProvider, this.getDescriptionNameGenerator()));
+                    compartmentNodeDescriptionProviders.add(new ExhibitStateInheritedCompartmentItemNodeDescriptionProvider(eClass, eReference, colorProvider, this.getDescriptionNameGenerator()));
                 } else if (SysmlPackage.eINSTANCE.getStateUsage().equals(eClass) && SysmlPackage.eINSTANCE.getUsage_NestedState().equals(eReference)) {
                     compartmentNodeDescriptionProviders.add(new StatesCompartmentNodeDescriptionProvider(eClass, eReference, colorProvider, this.getDescriptionNameGenerator(), true));
                     compartmentNodeDescriptionProviders.add(new StatesCompartmentItemNodeDescriptionProvider(eClass, eReference, colorProvider, this.getDescriptionNameGenerator(), true));
                     compartmentNodeDescriptionProviders.add(new StatesCompartmentNodeDescriptionProvider(eClass, eReference, colorProvider, this.getDescriptionNameGenerator(), false));
                     compartmentNodeDescriptionProviders.add(new StatesCompartmentItemNodeDescriptionProvider(eClass, eReference, colorProvider, this.getDescriptionNameGenerator(), false));
+                    compartmentNodeDescriptionProviders.add(new InheritedCompartmentItemNodeDescriptionProvider(eClass, eReference, colorProvider, this.getDescriptionNameGenerator()));
+                    compartmentNodeDescriptionProviders.add(new ExhibitStateInheritedCompartmentItemNodeDescriptionProvider(eClass, eReference, colorProvider, this.getDescriptionNameGenerator()));
                 } else if (SysmlPackage.eINSTANCE.getStateDefinition().equals(eClass) && SysmlPackage.eINSTANCE.getDefinition_OwnedState().equals(eReference)) {
                     compartmentNodeDescriptionProviders.add(new StatesCompartmentNodeDescriptionProvider(eClass, eReference, colorProvider, this.getDescriptionNameGenerator(), true));
                     compartmentNodeDescriptionProviders.add(new StatesCompartmentItemNodeDescriptionProvider(eClass, eReference, colorProvider, this.getDescriptionNameGenerator(), true));
                     compartmentNodeDescriptionProviders.add(new StatesCompartmentNodeDescriptionProvider(eClass, eReference, colorProvider, this.getDescriptionNameGenerator(), false));
                     compartmentNodeDescriptionProviders.add(new StatesCompartmentItemNodeDescriptionProvider(eClass, eReference, colorProvider, this.getDescriptionNameGenerator(), false));
+                    compartmentNodeDescriptionProviders.add(new InheritedCompartmentItemNodeDescriptionProvider(eClass, eReference, colorProvider, this.getDescriptionNameGenerator()));
+                    compartmentNodeDescriptionProviders.add(new ExhibitStateInheritedCompartmentItemNodeDescriptionProvider(eClass, eReference, colorProvider, this.getDescriptionNameGenerator()));
                 } else if ((SysmlPackage.eINSTANCE.getStateUsage().equals(eClass) && SysmlPackage.eINSTANCE.getUsage_NestedAction().equals(eReference))
                         || (SysmlPackage.eINSTANCE.getStateDefinition().equals(eClass) && SysmlPackage.eINSTANCE.getDefinition_OwnedAction().equals(eReference))) {
                     compartmentNodeDescriptionProviders.add(new CompartmentItemNodeDescriptionProvider(eClass, eReference, colorProvider, this.getDescriptionNameGenerator()));
@@ -647,6 +654,8 @@ private List<IDiagramElementDescriptionProvider<?>> createCompartmentsForListIte
                     compartmentNodeDescriptionProviders.add(new StatesCompartmentItemNodeDescriptionProvider(eClass, eReference, colorProvider, this.getDescriptionNameGenerator(), true));
                     compartmentNodeDescriptionProviders.add(new StatesCompartmentNodeDescriptionProvider(eClass, eReference, colorProvider, this.getDescriptionNameGenerator(), false));
                     compartmentNodeDescriptionProviders.add(new StatesCompartmentItemNodeDescriptionProvider(eClass, eReference, colorProvider, this.getDescriptionNameGenerator(), false));
+                    compartmentNodeDescriptionProviders.add(new InheritedCompartmentItemNodeDescriptionProvider(eClass, eReference, colorProvider, this.getDescriptionNameGenerator()));
+                    compartmentNodeDescriptionProviders.add(new ExhibitStateInheritedCompartmentItemNodeDescriptionProvider(eClass, eReference, colorProvider, this.getDescriptionNameGenerator()));
                 } else if ((SysmlPackage.eINSTANCE.getActionUsage().equals(eClass) && SysmlPackage.eINSTANCE.getUsage_NestedAction().equals(eReference))
                         || (SysmlPackage.eINSTANCE.getActionDefinition().equals(eClass) && SysmlPackage.eINSTANCE.getDefinition_OwnedAction().equals(eReference))) {
                     compartmentNodeDescriptionProviders.add(new CompartmentItemNodeDescriptionProvider(eClass, eReference, colorProvider, this.getDescriptionNameGenerator()));

diff --git a/doc/content/modules/user-manual/pages/release-notes/2026.7.0.adoc b/doc/content/modules/user-manual/pages/release-notes/2026.7.0.adoc
@@ -45,7 +45,7 @@ image::release-notes-assume-and-require-edge-tools.png[list available edge tools
 
 ** When using direct edit on feature elements that have a value expression (e.g., an `Attribute` with a default value defined), the expression part (after the `=` sign) is no longer part of the initial direct edit value and will be ignored if supplied in the new text value.
 Users should use the dedicated tools to edit expressions instead, as they ensure only valid expressions (with all names resolving) are accepted.
-
+** Add support for list item inheritance in _states_ and _exhibit states_ compartments.
 ** Add support for creating _Start_, _Done_, _Decision_, _Fork_, _Join_, and _Merge_ actions directly on the background of an `Action Flow View` diagram if its root element is an `ActionUsage` or `ActionDefinition`.
 
 * In the _Explorer_ view:
-Original file line number
+Diff line change
@@ Expand Up / @@ -64,6 +64,8 @@ public static class GraphicalIds { @@
             public static final String REQUIREMENT_USAGE_ID = "3eea9d01-7033-3f31-b7ef-561b5bc86d10";
+            public static final String STATE_DEFINITION_ID = "dbf7eccb-35e6-3ff1-b7b8-fc71f1a4094a";
             public static final String STATE_USAGE_ID = "1541c013-2cc7-3dd7-a39f-6e33d07b411e";
         }
@@ Expand Down @@