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UML and Data Modeling: A Reconciliation by David Hay

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In the Barker-Ellis version of an entity/relationship model, these are represented with the boxes representing sub-types being inside the box representing their super-type. For example, in Figure 4-3, Person and Organization are sub-types of Party. That is, every instance of Party is an instance of either a Person or an Organization. Organization, in turn, is a super-type of Internal Organization, Government, Company, Government Agency, Political Organization, and Household.

In this diagram, the boxes representing Person and Organization are shown inside the box representing their super-type, Party. Similarly, the boxes representing Internal Organization, Government, Company, Government Agency, Political ...

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