docs: public int getAcceptableActions(Component c)
      {
          if (c instanceof javax.swing.JTree 
              && ((javax.swing.JTree)c).getModel() instanceof OjbMetaDataTreeModel)
              return DnDWorkerConstants.DRAG_COPY | DnDWorkerConstants.DRAG_LINK;
          else return DnDWorkerConstants.NONE;
      }