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UML Sequence diagram showing messages that call operations on a lifeline.

A Call is a type of Message connector that extends the level of activation from the previous Message. All Self-Messages create a new activation level, but this focus of control usually ends with the next Message (unless activation levels are manually adjusted). Self-Message Calls, as depicted in the image of the first Call, indicate a nested invocation; new activation levels are added with each Call. Unlike a regular Message between elements, a Call between elements continues the existing activation in the source element, implying that the Call was initiated within the previous Message's activation scope.

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Call connector

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