return new RTFIterator(m_dtmRoot, m_xctxt.getDTMManager());
return new RTFIterator(m_dtmRoot, m_DTMXRTreeFrag.getXPathContext().getDTMManager());
  public DTMIterator asNodeIterator()  {    return new RTFIterator(m_dtmRoot, m_xctxt.getDTMManager());  }