lifeline
A role in an interaction that represents a participant over a period of time and, by extension, the participant itself. In a sequence diagram, it is shown as a vertical line, parallel to the time axis, with a head symbol showing its name and type.
Semantics
A lifeline represents a participant in an interaction. An interaction is based on a context in which objects interact. The context can be a structured classifier or a collaboration. The parts of the classifier or the roles of a collaboration have relationships to each other by which they exchange messages. A lifeline represents one of those parts or roles.
Because a part or role may have multiplicity greater than one, it may represent multiple objects during execution. A lifeline ...
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