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Disjoint
Disjoint is a constraint added to a set of generalization relationships to indicate that an instance of the parent may be an instance of one and only one of the children within the set.
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) cannot also be an instance of another subclass. Basic set theory states: that two sets are called disjoint if, and only if they have no elements in common. Expressed more formally it means that two sets A and B are overlapping if A (intersection) B is an empty set
A generalization relationship is related because it is the base element to which the disjoint constraint has been added. The disjoint constraint adds conditions and propositions to the underlying or base generalization relationship. The disjoint constraint is one of the UML standard elements.
