m_pos--; return m_nl.item(prev);
m_pos = -1; return m_docFrag;
    public Node previousNode()                             throws DOMException    {      int prev = m_pos-1;      if((prev >= 0) && (prev < m_nl.getLength()))        {        m_pos--;        return m_nl.item(prev);      }      else        return null;    }