-public abstract class AbstractVTKNodeMap<E extends INode> implements VTKNodeMap<E>, IMappingListener, RenderListener, NodeListener, UndoRedoSupport.ChangeListener{
+public abstract class AbstractVTKNodeMap<DBObject,E extends INode> implements VTKNodeMap<DBObject,E>, IMappingListener, RenderListener, NodeListener, UndoRedoSupport.ChangeListener{