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Overlapping
Overlapping is a constraint added to a set of generalization relationships to indicate that an instance of one child may simultaneously be an instance of another.
Explanation
This constraint is added to a group of generalization relationships to indicate that any instance of one of the subclasses (connected to its parent by the constrained relationship) can be an instance of another subclass. Basic set theory states that two sets are called overlapping if, and only if they have elements in common. Expressed more formally it means that two sets A and B are overlapping if A (intersection) B is non empty.
A generalization relationship is related because it is the base element to which the overlapping constraint has been added. The overlapping constraint adds conditions and propositions to the underlying or base generalization relationship. The overlapping constraint is one of the UML standard elements.
