w.tagln(CONVEYANCE_ID_TAG,getConveyanceIDAt(i));
w.tagln(CONVEYANCE_ID_TAG,getConveyanceIDAt(i).toString());
  public void toXML(XMLWriter w) throws IOException{    w.optagln(NAME_TAG, UID_ATTR, getUID(),	      START_TIME_ATTR, Long.toString(getStartTime()),	      END_TIME_ATTR, Long.toString(getEndTime()),	      PRETTY_NAME_ATTR, getPrettyName());    for(int i=0;i<numConveyances();i++)      w.tagln(CONVEYANCE_ID_TAG,getConveyanceIDAt(i));    w.cltagln(NAME_TAG);  }