The model for Criminal Justice (continued in Figure 18-7) relies heavily on the Party Characteristic entity class, first described in Chapter 4. Here, however, instead of making Party Category a sub-type of Party Characteristic (along with Continuous Party Characteristic), Party Characteristic and Party Category are separated. This makes no difference in the logic of the model. The figure does add the concept of Category Scheme, however, which groups categories together.

A Characteristic is a parameter or attribute that can accept a continuous value, such as a real number or a date. (This is equivalent to Continuous Party Characteristic in Chapter 4.) Examples include, for Person, “Height”, “Weight”, and so forth. ...

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