t.stop();
  public Instance output() throws Exception {    if (m_OutputFormat == null) {      throw new Exception("No output instance format defined");    }    if (m_OutputQueue.empty()) {      return null;    }    Instance result = (Instance)m_OutputQueue.pop();    //util.Timer t = util.Timer.getTimer("Filter::output"); t.start();    // Clear out references to old strings occasionally    if (m_OutputQueue.empty() && m_NewBatch &&         (m_OutputStringAtts.length > 0) &&        (m_OutputFormat.numInstances() >= 10)) {      m_OutputFormat = m_OutputFormat.stringFreeStructure();    }    //t.stop();    return result;  }