code: def serialize(self):
          
          return {'uuid': self.uuid, 'ref': self.ref, 'sticky': self.sticky, 'notify': self.notify,
                  'end_time': self.end_time, 'author': self.author, 'comment': self.comment}
docs: This function serialize into a simple dict object.
          It is used when transferring data to other daemons over the network (http)
  
          Here we directly return all attributes
  
          :return: json representation of a Acknowledge
          :rtype: dict