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Completeness Constraint. * The Completeness Constraint addresses the issue of whether or not an occurrence of a Supertype must also have a corresponding Subtype occurrence. * The Total Specialization Rule specifies that this is the case. This is diagrammed with a double line from the Supertype to the circle as shown here. * The Partial Specialization Rule is the one we have followed thus far in the notes (single line to the circle) -- no such constraint exists. You can have a Supertype named VEHICLE and a Subtype named AUTO, but an occurrence of a vehicle need not be an automobile.

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