Also in Figure 20-3 are the entity classes, Instrument Category and Instrument Category Scheme. As we saw in the Criminal Justice model (Chapter 18), this is an alternative to the way categories and characteristics are described in the Level 1 Enterprise Model. In these more concrete contexts, the notion of categorization is sufficiently different from the notion of describing things in terms of their Characteristics, that a separate treatment is called for.

An Instrument Category is a grouping of Instruments according to common characteristics. Instrument Classification is the fact that a particular Instrument falls into a particular Instrument Category at a particular time (between its Effective Date and its Until Date ...

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