def __response_message_descriptor(self, message_type, method_id):
if message_type != message_types.VoidMessage():<EOL><INDENT>self.__parser.add_message(message_type.__class__)<EOL>self.__response_schema[method_id] = self.__parser.ref_for_message_type(<EOL>message_type.__class__)<EOL>return {'<STR_LIT>': self.__response_schema[method_id]}<EOL><DEDENT>else:<EOL><INDENT>return None<EOL><DEDENT>
Describes the response.

        Args:
          message_type: messages.Message class, The message to describe.
          method_id: string, Unique method identifier (e.g. 'myapi.items.method')

        Returns:
          Dictionary describing the response.