public void copy(DTMAxisIterator nodes, SerializationHandler handler) throws TransletException {
   if (_dom != null) {
     _dom.copy(nodes, handler);
   } else {
     super.copy(nodes, handler);
   }
 }
 public void copy(final int node, SerializationHandler handler) throws TransletException {
   if (_dom != null) {
     _dom.copy(node, handler);
   } else {
     super.copy(node, handler);
   }
 }