Execution of an atomic action, typically the invocation of an operation.
An activity state is a simple state with an entry action whose only exit transition is triggered by the implicit event of completing the execution of the entry action. The state therefore corresponds to the execution of the entry action itself and the outgoing transition is activated as soon as the action has completed its execution. An ActivityState may perform more than one action as part of its entry action. An Activitystate may not have an exit action, do activity, or internal transitions. Being a state, an activity state can belong to a state machine or a state
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