Transitions

A state transition indicates that an object in the source state will perform certain specified actions and enter the destination state when a specified event occurs or when certain conditions are satisfied. A state transition is a relationship between two states or two activities, or between an activity and a state.

You can show one or more state transitions from a state as long as each transition is unique. Transitions originating from a state cannot have the same event, unless there are conditions on the event. Transitions appear on statechart and activity diagrams.

You should label each state transition with the name of at least one event that causes the state transition. You do not have to use unique labels for state transitions because the same event can cause a transition to many different states or activities.

Transitions are labeled with the following syntax:

event (arguments) [condition] / action ^ target.sendEvent (arguments)

Only one event is allowed per transition, and one action per event.

Events, conditions, and actions must be added by editing the label or through the State Transition Specification.