![]() A thin rectangle on a lifeline) represents the period during which an element is performing an operation.A lifeline represents an individual participant in the Interaction.A person may play the role of several different actors and, conversely, a given actor may be played by multiple different person. ![]() An actor does not necessarily represent a specific physical entity but merely a particular role of some entity.represent roles played by human users, external hardware, or other subjects.external to the subject (i.e., in the sense that an instance of an actor is not a part of the instance of its corresponding subject). ![]()
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