code: public ContentHandler getInputContentHandler(boolean doDocFrag)
    {
  
      if (null == m_inputContentHandler)
      {
  
        //      if(null == m_urlOfSource && null != m_stylesheetRoot)
        //        m_urlOfSource = m_stylesheetRoot.getBaseIdentifier();
        m_inputContentHandler = new TransformerHandlerImpl(this, doDocFrag,
                m_urlOfSource);
      }
  
      return m_inputContentHandler;
    }
docs: Get a SAX2 ContentHandler for the input.
  
  @param doDocFrag true if a DocumentFragment should be created as
  the root, rather than a Document.
  
  @return A valid ContentHandler, which should never be null, as
  long as getFeature("http://xml.org/trax/features/sax/input")
  returns true.