code: def create(cls, name, protocol_number, protocol_agent=None, comment=None):
          
          json = {'name': name,
                  'protocol_number': protocol_number,
                  'protocol_agent_ref': element_resolver(protocol_agent) or None,
                  'comment': comment}
  
          return ElementCreator(cls, json)
docs: Create the IP Service
  
          :param str name: name of ip-service
          :param int protocol_number: ip proto number for this service
          :param str,ProtocolAgent protocol_agent: optional protocol agent for
              this service
          :param str comment: optional comment
          :raises CreateElementFailed: failure creating element with reason
          :return: instance with meta
          :rtype: IPService