         // No implementation required for XMLFileStore
     }
     
-
-    
     //MARK: - Relationship
     
     var relationshipList = [Relationship]()
     var maxRelationshipUID : UID = 0
+    
+    func onAllRelationships(_ closure: (Relationship) -> Void) {
+        for rel in relationshipList {
+            closure(rel)
+        }
+    }
     
     // Register a new or loaded relationship
     public func register(_ rel: Relationship) {

        return nil
    }
    
    
    public func update(_ aNode: Node) {
        // No implementation required for XMLFileStore

        //readXMLFile()
    }
    
    //MARK: - Graphs
    
    var graphList = [Graph]()
    
    public func register(_ graph: Graph) {
        graphList.append(graph)
    }

    //MARK: - Node
    
    //var nodeList = [Node]()
