def add_constraints(self):
        raise NotImplementedError
get a struct defining a service
dataset/ETHPy150Open sdispater/orator/orator/orm/relations/relation.py/Relation.add_constraints--crossover with--dataset/ETHPy150Open marineam/nagcat/python/nagcat/nagios_api.py/NagiosXMLRPC.xmlrpc_getHostService