code: public NodeIterator nodeset() throws javax.xml.transform.TransformerException
    {
      return (m_origObj instanceof NodeIterator) 
                     ? (NodeIterator)m_origObj : super.nodeset();      
    }
docs: Cast result object to a nodelist. Always issues an error.
  
  @return null
  
  @throws javax.xml.transform.TransformerException