enumerateNodes(m.getBaseRoot(),nodeNumbers);
  public void diff( ContentHandler ch ) throws SAXException {    enumerateNodes(m.getBaseRoot(),nodeNumbers);    ch.startDocument();    ch.startElement("","","diff",EMPTY_ATTS);    Vector stopNodes = new Vector();    m.getAreaStopNodes(stopNodes, m.getBranchRoot());    copy(m.getBaseRoot(), m.getBranchRoot(), ch, stopNodes);    ch.endElement("","","diff");    ch.endDocument();  }