More UML Activity Diagram Notation - UML

How to show that an activity is expanded in another activity diagram? Figures illustrate, using the rake symbol.

How to show conditional branches? See the decision symbol used in Figure. The related merge symbol shows how flows can come back together.

Figure 28.4 An activity will be expanded in another diagram

Figure 28.5 The expansion of an activity

Signals are shown in Figure. They are useful, for example, when you need to model events such as time triggering an action, or a cancellation request.

There's a lot more UML activity notation available. This short introduction merely highlights some of the most common elements.

Figure 28.6 Signals

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