code: public void callArgVisitors(XPathVisitor visitor)
    {
        for (int i = 0; i < m_argVec.size(); i++)
        {
           Expression exp = (Expression)m_argVec.elementAt(i);
           exp.callVisitors(new ArgExtOwner(exp), visitor);
        }
      
    }
docs: Call the visitors for the function arguments.