Updated Reference::equals to use Object::equals (OMG Issue FUML13-26).

Author: seidewitz

org.modeldriven.fuml/src/main/java/fUML/Semantics/Classes/Kernel/Object_.java

@@ -118,6 +118,13 @@ public fUML.Semantics.Classes.Kernel.Value copy() {
 		return newObject;
 
 	} // copy
+	
+	public boolean equals(Value otherValue) {
+		// Test if this object is equal to the otherValue.
+		// To be equal, the otherValue must be the same object as this object.
+		
+		return this == otherValue;
+	} // equals
 
 	protected fUML.Semantics.Classes.Kernel.Value new_() {
 		// Create a new object with no type, feature values or locus.

org.modeldriven.fuml/src/main/java/fUML/Semantics/Classes/Kernel/Reference.java

@@ -61,7 +61,11 @@ public boolean equals(fUML.Semantics.Classes.Kernel.Value otherValue) {
 
 		boolean isEqual = false;
 		if (otherValue instanceof Reference) {
-			isEqual = (((Reference) otherValue).referent == this.referent);
+			if (this.referent == null) {
+				isEqual = ((Reference)otherValue).referent == null;
+			} else {
+				isEqual = this.referent.equals(((Reference) otherValue).referent);
+			}
 		}
 
 		return isEqual;