docs: public Transferable getTransferable(Component c)
      {
          if (c instanceof javax.swing.JTree 
              && ((javax.swing.JTree)c).getModel() instanceof OjbMetaDataTreeModel)
          {
              try
              {
                  javax.swing.JTree tree = (javax.swing.JTree)c;
                  OjbMetaDataTreeModel model = (OjbMetaDataTreeModel)tree.getModel();
                  AttributeDescriptorBase descriptors[] = new AttributeDescriptorBase[tree.getSelectionCount()];
                  for (int i = 0; tree.getSelectionPaths() != null && i < tree.getSelectionPaths().length; i++)
                  {
                      Object o = ((OjbMetaTreeNode)tree.getSelectionPaths()[i].getLastPathComponent()).getAssociatedDescriptor();
                      if (o instanceof AttributeDescriptorBase)
                      {
                          System.err.println("   adding Node" + o);
                          descriptors[i] = (AttributeDescriptorBase) o;
                      }
                  }
                  return new OjbMetadataTransferable(descriptors);
              }
              catch (Throwable t)
              {
                  t.printStackTrace();
              }
          }
          return null;
      }