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This Concept Map, created with IHMC CmapTools, has information related to: the data model, E-R Schema comprises attributes, relationship sets individually recognised by superkey, E-R Schema has relationship sets, E-R Schema pictorialised by ER diagrams, relationship sets individually recognised by entity sets, E-R Schema defines constraints, E-R Schema has entity sets, relationship sets constitute of relations, E-R Data Model defines E-R Schema, entity sets participate in relations, superkey reduces to primary key