System Level Design Languages:Interaction Overview Diagram

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Interaction Overview Diagram

Another type of interaction diagram is the interaction overview diagram. This diagram is similar to the activity diagram, with the difference that the interaction overview diagrams accept interaction diagrams as their nodes. As discussed earlier in the section on activity diagrams, an interaction diagram includes four of UML 2.0 diagrams. An interaction overview diagram gives the designer a general view of a system and interaction between its various parts. The interaction overview diagram nodes can be represented as interaction occurrences or interaction elements.

An interaction occurrence node is a diagram node depicted as a reference to another existing diagram and is marked with the ref keyword.

An interaction element node is a diagram node the details of elements of which are inside it. Interaction element nodes are useful only for small diagrams. An example of an interaction overview diagram is shown in Figure 86.22 for the SSimBoard system. Each node in this figure is an activity diagram

System Level Design Languages-0211

from different parts of the system. For example the Get Data And Analyze activity diagram refers to the diagram of Figure 86.21.

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