code: public int getAnalysisBits()
    {
      if (null != m_expr && m_expr instanceof PathComponent)
      {
        return ((PathComponent) m_expr).getAnalysisBits();
      }
      return WalkerFactory.BIT_FILTER;
    }
docs: Get the analysis bits for this walker, as defined in the WalkerFactory.
  @return One of WalkerFactory#BIT_DESCENDANT, etc.