A transition leaving a state defines the response of an object in the state to the occurrence of an event. In general, a transition has an event trigger, a guard condition, an effect, and a target state. Table 7-2 shows kinds of transitions and implicit effects invoked by transitions.

Table 7-2. Kinds of Transitions and Implicit Effects
Transition KindDescriptionSyntax
entry transitionThe specification of an entry activity that is executed when a state is enteredentry/ activity
exit transitionThe specification of an exit activity that is executed when a state is exitedexit/ activity
external transitionA response to an event that causes a change of state or a self-transition, together with a specified effect. It may also cause the execution ...

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