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The Movie class, defined later in this chapter, in
Segment 768, is a good example of a model class because it
embodies knowledge about movies, but embodies no information about
information display. Conversely, the Meter class, shown in
Segment 748 and in AppendixB, is a good example of a
view class, because it embodies knowledge about information display, but
embodies no information about any particular application domain.