code: private String getLocalNameUnknown(String value)
      {
          int idx = value.lastIndexOf(':');
          if (idx >= 0)
              value = value.substring(idx + 1);
          idx = value.lastIndexOf('@');
          if (idx >= 0)
              value = value.substring(idx + 1);
          return (value);
      }
docs: Utility function for calls to local-name().
  
  Don't want to override static function on SerializerBase
  So added Unknown suffix to method name.