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Duration Constraint
A duration constraint is a type of interval constraint that specifies that one or more model elements must conform to a restriction specified by a duration interval. A duration constraint is not the duration interval itself but a constraint, which associates the interval with one or more elements, specifying how the interval restricts the duration semantics of the element(s).
Explanation
Like any constraint the duration constraint is used when the formal semantics of an element are insufficient to express some restriction on the modeled elements. A duration interval defines minimum and maximum values defining a range, and this range of allowable values is specified by the duration constraint and applied to one or more elements. If the constraint does not evaluate to TRUE in a running system the duration interval is considered to be invalid.
