communication diagram
A diagram that shows interactions organized around the parts of a composite structure or the roles of a collaboration. Unlike a sequence diagram, a communication diagram explicitly shows the relationships among the elements. On the other hand, a communication diagram does not show time as a separate dimension, so the sequence of messages and the concurrent threads must be determined using sequence numbers. Sequence diagrams and communication diagrams both express interactions, but show them in different ways.
See collaboration, pattern, sequence diagram.
Notation
A communication diagram is a structured class or a collaboration together with messages that form an interaction. It is shown as a graph whose nodes are rectangles ...
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