The overlap rule specifies that if an entity instance of the supertype is a member of one subtype, it can simultaneously be a member of two (or more) subtypes.

Name: The overlap rule specifies that if an entity instance of the supertype is a member of one subtype, it can simultaneously be a member of two (or more) subtypes.
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The overlap rule allows an entity instance of a supertype to belong to multiple subtypes simultaneously, unlike the disjoint rule which restricts membership to only one subtype.

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