fact: Definition UnConstrRelation (RelationSchema : Heading) := Ensemble (@IndexedTuple RelationSchema).
imports: Coq.Lists.List Coq.Strings.String Coq.Logic.FunctionalExtensionality Coq.Sets.Ensembles Fiat.Common.StringBound Fiat.Common.Ensembles.IndexedEnsembles Fiat.QueryStructure.Specification.Representation.Schema Fiat.QueryStructure.Specification.Representation.Heading Fiat.QueryStructure.Specification.Representation.Tuple