ST6RI-856 Revised impl of variation defs and usages being abstract.

- Moved it from additional overrides in DefinitionImpl and UsageImpl to
postProcess in DefinitionAdapter and UsageAdapter.

Author: seidewitz

org.omg.sysml/src/org/omg/sysml/adapter/DefinitionAdapter.java

@@ -1,6 +1,6 @@
 /*******************************************************************************
  * SysML 2 Pilot Implementation
- * Copyright (c) 2021, 2024 Model Driven Solutions, Inc.
+ * Copyright (c) 2021, 2024, 2025 Model Driven Solutions, Inc.
  *    
  * This program is free software: you can redistribute it and/or modify
  * it under the terms of the GNU Lesser General Public License as published by
@@ -34,4 +34,13 @@ public Definition getTarget() {
 		return (Definition)super.getTarget();
 	}
 
+	@Override
+	public void postProcess() {
+		super.postProcess();
+		Definition target = getTarget();
+		if (target.isVariation()) {
+			target.setIsAbstract(true);
+		}
+	}
+	
 }

org.omg.sysml/src/org/omg/sysml/adapter/UsageAdapter.java

@@ -1,6 +1,6 @@
 /*******************************************************************************
  * SysML 2 Pilot Implementation
- * Copyright (c) 2021-2024 Model Driven Solutions, Inc.
+ * Copyright (c) 2021-2025 Model Driven Solutions, Inc.
  *    
  * This program is free software: you can redistribute it and/or modify
  * it under the terms of the GNU Lesser General Public License as published by
@@ -53,6 +53,15 @@ public Usage getTarget() {
 
 	// Post-processing
 
+	@Override
+	public void postProcess () {
+		super.postProcess();
+		Usage target = getTarget();
+		if (target.isVariation()) {
+			target.setIsAbstract(true);
+		}
+	}
+	
 	@Override
 	protected void setIsVariableIfConstant() {
 	}

org.omg.sysml/syntax-gen/org/omg/sysml/lang/sysml/impl/DefinitionImpl.java

@@ -784,15 +784,6 @@ public EList<VariantMembership> getVariantMembership() {
 		return (EList<VariantMembership>)VARIANT_MEMBERSHIP__ESETTING_DELEGATE.dynamicGet(this, null, 0, true, false);
 	}
 
-	// Additional Overrides
-	
-	@Override
-	public boolean isAbstract() {
-		return isVariation() || super.isAbstract();
-	}
-	
-	//
-
 	/**
 	 * <!-- begin-user-doc -->
 	 * <!-- end-user-doc -->

org.omg.sysml/syntax-gen/org/omg/sysml/lang/sysml/impl/UsageImpl.java

@@ -1046,11 +1046,6 @@ public boolean isSetIsVariable() {
 
 	// Additional overrides
 
-	@Override
-	public boolean isAbstract() {
-		return isVariation() || super.isAbstract();
-	}
-
 	@Override
 	public boolean isComposite() {
 		return UsageUtil.isComposite(this, isComposite);