This paper describes database operations on the entity level in the semantic data model based on IS-A relationship. As a new class interrelationship among those entities which represent composite concepts, entity-sharable relationship is identified. T...
This paper describes database operations on the entity level in the semantic data model based on IS-A relationship. As a new class interrelationship among those entities which represent composite concepts, entity-sharable relationship is identified. The is-a relationship IS further classified into four cases-conceptual, attribute-defined, set-operated, and existence-constrained is-a. For each case, a richer set of invariants to support database operations is explored.