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OccurrenceSpecification (from BasicInteractions ) on page 517
An ExecutionOccurrenceSpecification represents moments in time at which actions or behaviors start or finish.
No additional attributes
• event : ExecutionEvent  Redefines the event referenced to be restricted to an execution event.
• execution : ExecutionSpecification  References the execution specification describing the execution that is started or finished at this execution event.
No additional constraints
No additional semantics
Changes from previous UML
New in UML 2.0.