The disjoint rule specifies that if an entity instance of the supertype is a member of one subtype, it MUST simultaneously be a member of another subtype.

Name: The disjoint rule specifies that if an entity instance of the supertype is a member of one subtype, it MUST simultaneously be a member of another subtype.
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The disjoint rule specifies that an entity instance of the supertype can be a member of only one subtype at a time, not multiple subtypes simultaneously.

The Disjoint Rule Specifies That If an Entity Instance of the Supertype