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UML and Data Modeling: A Reconciliation by David Hay

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While the concept of super-types and sub-types is essentially the same in UML and architectural data modeling, they are represented differently.  Chapter Four will describe the change in how (entity class) sub-types are shown in entity/relationship models. (See pages 91-97.)  Specifically, unlike the native UML layout of showing sub-types alongside super-types, the sub-type boxes in an entity/relationship model are shown as being inside their respective super-types.  In the interest of continuity with UML, the sub-type relationship symbols are maintained, however, even as they are between an interior box and its container.

There is another feature to UML that requires mention, however.  While ...

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