sequence diagram
A diagram that shows object interactions arranged in time sequence. In particular, it shows the objects participating in an interaction and the sequences of messages exchanged.
See also activation, collaboration, lifeline, message.
Semantics
A sequence diagram represents an interaction—a set of communications among objects arranged visually in time order. Unlike a communication diagram, a sequence diagram shows time sequences explicitly but does not include object relationships. It can exist in a descriptor form (describing all possible scenarios) and in an instance form (describing one actual scenario). Sequence diagrams and collaboration diagrams express similar (although not identical) information, but they show it in different ...
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