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Enterprise Model Patterns: Describing the World (UML Version) by David C. Hay

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Describing Assets

In principle, every instance of an entity class is described by the same set of attributes. Occasionally, an instance might have a null value for one or two attributes, but this should not be common. What about the case, however, where there are a myriad of different kinds of Asset Specifications, and these are of a wide variety of different products—each of which could be described by a completely different set of attributes? An Apple iPod is a very different product from an HP Personal Computer, and both of these are different from a GE Refrigerator. We could extend the sub-type structure of Asset Specification, but it would quickly become insurmountably complex. This is most often a concern when the organization is defining ...

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