Derived union

Derived union

Derived union is a term from Unified Modeling Language which applies to some structural feature of some element and means that the feature is constructed (as a set union) from those features of derived elements which "subset" this feature. For example, associations general and specific of Generalization element subset associations target and source of DirectedRelationship. It means that if Generalization instance is asked, e.g. for target association, it returns an instance of general association.

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