[2034] Fix textual import to be able to annotate relationships

CHANGELOG.adoc

@@ -45,6 +45,7 @@ For example `ViewUsage` elements are no longer rendered in _parts_ compartments.
 - https://github.com/eclipse-syson/syson/issues/2026[#2026] [explorer] Fix an issue where creating a new model using the _Create a new model_ action in the _Explorer_ view was not adding the ".sysml" extension to the model name.
 - https://github.com/eclipse-syson/syson/issues/1998[#1998] [metamodel] Missing implicit TypeFeaturing.
 - https://github.com/eclipse-syson/syson/issues/2023[#2023] [diagrans] On diagrams, `ConnectionDefinition` graphical nodes are now correctly labelled as `«connection def»`.
+- https://github.com/eclipse-syson/syson/issues/2034[#2034] [import] Fix textual import to be able to annotate `Relationships`.
 
 === Improvements
 

backend/application/syson-application/src/test/java/org/eclipse/syson/application/imports/ImportSysMLModelTest.java

@@ -61,6 +61,7 @@
 import org.eclipse.syson.sysml.LiteralRational;
 import org.eclipse.syson.sysml.LiteralString;
 import org.eclipse.syson.sysml.Membership;
+import org.eclipse.syson.sysml.MembershipExpose;
 import org.eclipse.syson.sysml.MetadataAccessExpression;
 import org.eclipse.syson.sysml.MetadataDefinition;
 import org.eclipse.syson.sysml.MetadataUsage;
@@ -181,6 +182,29 @@ public void unnamedRedefinedReferenceFeature() throws IOException {
         }).check(input);
     }
 
+    @DisplayName("GIVEN an MetadataUsage annotating a ExposeMembership, WHEN importing the model, THEN the Annotation holding the MetadataUsage should be stored in ownedRelationships.")
+    @Test
+    public void metadataUsageOnExposeMembership() throws IOException {
+        var input = """
+                package Test {
+                     metadata def MyAnnotation;
+
+                     item def MyItem;
+
+                     view MyView {
+                         expose MyItem { @MyAnnotation; }
+                     }
+
+                    item def MyItem2;
+                 }
+                """;
+        this.checker.checkImportedModel(resource -> {
+            List<MembershipExpose> membershipExposes = EMFUtils.allContainedObjectOfType(resource, MembershipExpose.class).toList();
+            assertThat(membershipExposes).hasSize(1);
+            assertThat(membershipExposes.get(0).getOwnedRelationship()).hasSize(1);
+        }).check(input);
+    }
+
     @DisplayName("GIVEN a redefinition of a part with the same name as the redefined part, WHEN importing the model, THEN the redefintion's redefined feature is correctly resolved.")
     @Test
     public void namedRedefinedReferenceFeature() throws IOException {

backend/application/syson-sysml-import/src/main/java/org/eclipse/syson/sysml/parser/translation/EReferenceComputer.java

@@ -1,5 +1,5 @@
 /*******************************************************************************
- * Copyright (c) 2024 Obeo.
+ * Copyright (c) 2024, 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
@@ -23,6 +23,7 @@
 import org.eclipse.emf.ecore.EClass;
 import org.eclipse.emf.ecore.EObject;
 import org.eclipse.emf.ecore.EReference;
+import org.eclipse.syson.sysml.Relationship;
 import org.eclipse.syson.sysml.SysmlPackage;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
@@ -73,7 +74,11 @@ public Optional<EReference> getContainmentReference(EObject owner, EClass target
              */
 
             if (references.equals(REL_CONTAINEMTS_REF)) {
-                if (owner.eContainingFeature() == SysmlPackage.eINSTANCE.getRelationship_OwnedRelatedElement()) {
+                // Case where the previously described pattern is not correct.
+                // Here we have a Relationship holding a Relationship in "ownedRelationship"
+                if (owner instanceof Relationship && SysmlPackage.eINSTANCE.getAnnotation().isSuperTypeOf(targetEClass)) {
+                    ref = Optional.of(SysmlPackage.eINSTANCE.getElement_OwnedRelationship());
+                } else if (owner.eContainingFeature() == SysmlPackage.eINSTANCE.getRelationship_OwnedRelatedElement()) {
                     ref = Optional.of(SysmlPackage.eINSTANCE.getElement_OwnedRelationship());
                 } else {
                     ref = Optional.of(SysmlPackage.eINSTANCE.getRelationship_OwnedRelatedElement());

doc/content/modules/user-manual/pages/release-notes/2026.3.0.adoc

@@ -63,6 +63,23 @@ part system {
 }
 ```
 
+** Fix the textual import so `Relationships` can be annotated.
+Such as in :
+
+```
+package Test {
+    metadata def MyAnnotation;
+
+    item def MyItem;
+
+    view MyView {
+        expose MyItem { @MyAnnotation; } // The MembershipExpose is annotated with MyAnnotation
+    }
+
+   item def MyItem2;
+}
+```
+
 * In _Explorer_ view:
 
 ** Fix an issue where creating a new model using the _Create a new model_ action in the _Explorer_ view was not adding the ".sysml" extension to the model name.