Type")     attrs.IsAbstract = False     node.NodeAttributes = attrs     server.add_nodes([node])     refs = []     ref = ua.AddReferencesItem()     ref.IsForward = True     ref.ReferenceTypeId = NumericNodeId(00, 0)     ref.SourceNodeId = NumericNodeId(00000, 0)     ref.TargetNodeClass = NodeClass.DataType     ref.TargetNodeId = NumericNodeId(00000, 0)     refs.append(ref)     ref = ua.AddReferencesItem()     ref.IsForward = True     ref.ReferenceTypeId = NumericNodeId(00, 0)     ref.SourceNodeId = NumericNodeId(00000, 0)     ref.TargetNodeClass = NodeClass.DataType     ref.TargetNodeId = NumericNodeId(00000, 0)     refs.append(ref)     ref = ua.AddReferencesItem()     ref.IsForward = True     ref.ReferenceTypeId = NumericNodeId(00, 0)     ref.SourceNodeId = NumericNodeId(00000, 0)     ref.TargetNodeClass = NodeClass.DataType     ref.TargetNodeId = NumericNodeId(00000, 0)     refs.append(ref)     ref = ua.AddReferencesItem()     ref.IsForward = False     ref.ReferenceTypeId = NumericNodeId(00, 0)     ref.SourceNodeId = NumericNodeId(00000, 0)     ref.TargetNodeClass = NodeClass.DataType     ref.TargetNodeId = NumericNodeId(00, 0)     refs.append(ref)     server.add_references(refs)         node = ua.AddNodesItem()     node.RequestedNewNodeId = NumericNodeId(00000, 0)     node.BrowseName = QualifiedName('<