docs: public Object getDocumentRoot(MatchSpaceKey msg) 
      throws BadMessageFormatMatchingException
    {
      if (tc.isAnyTracingEnabled() && tc.isEntryEnabled())
        tc.entry(cclass, "getDocumentRoot", msg);
  
      Object docRoot = null;
      
      if (tc.isAnyTracingEnabled() && tc.isEntryEnabled())
        tc.exit(cclass, "getDocumentRoot", docRoot);    
      return docRoot;
    }