If an Information Resource is a collection of concepts, it is worthwhile to stop and examine those concepts in our model. Figure 10-3 shows Concept as an entity class, where a concept is something that we understand to exist or to be the case. In this context, a Concept is an aspect of an enterprise’s operations or environment. It may be about something tangible or it may be an abstract idea generalized from particular instances. It is the set of Concepts that give meaning to our language.[43]

We can only deal with Concepts if we can describe them in language in some way. In particular, the only concepts we can communicate must be represented by one or more linguistic Expressions. An Expression is a collection of Words, Phrases, or ...

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