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UML and Data Modeling: A Reconciliation by David Hay

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As stated above, an entity is the name of a thing or object of significance to a business, whether real or imagined, about which information needs to be known or held.[40] This may be a concrete thing, such as Charles Smith, or Oxfordshire County, or it may be an abstraction, such as Purchase Order 230493 or The fact that George Saunders was made Project Manager of the Interstate 10 project on 23 October, 2005. An entity class is a named set of such things, all with the same set of attributes. Each box on the diagram represents an entity class. For example, the entities just described might be instances of Person, Geographic Location, Purchase Order, and Project Role Assignment, respectively.

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