16.3. Collaborations between Subsystems
Similarly, when a class has state behavior, there are collaborations between classes in different subsystems.
When a class in one subsystem collaborates with a class in another subsystem, we show the imported class on the collaboration diagram using only the name of the class, with either an annotation “from <subsystem name>,” or a stereotype «imported», as shown in Figure 16.5.
Figure 16.5. Imported Classes on a Collaboration Diagram
The external entities (e.g., Customer, Warehouse Supervisor) are not part of any subsystem. They represent the explicit interface points to the domain.
To depict the collaborations ...
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