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Collaboration Diagram
A collaboration diagram describes a pattern of interaction among objects; it shows the objects participating in the
interaction by their links to each other and the messages that they send to each other.

A collaboration diagram is semantically identical to a sequence diagram (see Guidelines: Sequence Diagram in the Business Object Model) but focuses on the objects, while the latter focuses on the interactions. A collaboration diagram should present the subset of objects relevant to the affected working sequence, including their links, messages, and message sequences.

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