Adding execution occurrences to interactions

In Unified Modeling Language (UML) sequence diagrams, you can add execution occurrences to lifelines to show the start and finish behaviors or flow of interactions to visually represent interactions for Java™ or Enterprise JavaBeans™ (EJB) applications.

An execution occurrence is created automatically when you create a synchronous or an asynchronous message on a lifeline. You can also manually create an execution occurrence to show the start and finish behavior in an interaction.

You can nest an execution occurrence to indicate nested behavior in a call sequence. A nested execution occurrence overlaps an existing execution occurrence, and enables you to distinguish exactly where the activity associated with each message starts and finishes.

Related concepts
Execution occurrences
Related tasks
Creating and populating UML sequence diagrams
Managing lifelines
Creating and editing messages on lifelines
Managing combined fragments
Referencing interactions from within other interactions
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