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UML and Data Modeling: A Reconciliation by David Hay

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More detailed descriptions of each point of view follow in the next two sections.

In general, entity/relationship modeling books acknowledge that relationships can be named with a verb phrase, creating a semantic structure of subject/predicate/object. Specification about what such a verb phrase might consist of varies from author to author. It can be as simple as has, or is related to, or it can be as specific as lives at or is assigned to.

This author, however, endorses the Barker-Ellis approach. It adds a semantic discipline to the structure of these verb phrases. Specifically, in all cases, the verb is to be. This has the effect that this part of the predicate can be used to specify the relationship ...

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