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lifeline
subject			fact

lifeline	becomes an activation box during the period of time that the object is performing computations
	has definition A dashed line in a sequence diagram indicating the period of time during which an object exists
	is a subtopic of 8.1 - Interaction Diagrams
	is attached to each object or actor in a sequence diagram
	is drawn as a vertical dashed line
	is a kind of symbol in sequence diagram