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transition in an activity diagram
subject			fact

transition in an activity diagram	is a subtopic of 8.3 - Activity Diagrams
	is usually caused by an internal event
	is a kind of transition
transition	is represented by transition symbol in a state diagram
	may be triggered by a condition becoming true
	may be triggered by an event
	occurs instantaneously
	represents a change of state in response to an event
event	can cause a system or object to change from one state to another