def __contains__(self, offer):
        for mask, quality in self._parsed_nonzero:
            if self._match(mask, offer):
                return True
Serialize the RDFStruct object into a string.
dataset/ETHPy150Open AppScale/appscale/AppServer/lib/webob-1.1.1/webob/acceptparse.py/Accept.__contains__--crossover with--dataset/ETHPy150Open google/grr/grr/lib/rdfvalues/structs.py/AbstractSerlializer.SerializeToString