m_xmlStr = m_dtm.getStringValue(m_dtmRoot);
m_xmlStr = m_DTMXRTreeFrag.getDTM().getStringValue(m_dtmRoot);
  public XMLString xstr()  {    if(null == m_xmlStr)      m_xmlStr = m_dtm.getStringValue(m_dtmRoot);        return m_xmlStr;  }