Unified Modeling Language Reference Manual, The, Second Edition

Activity

An activity definition is shown in an activity diagram (Figure 8-1).

Figure 8-1. Activity diagram

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An activity node is shown as a box with rounded corners containing a description of the activity. A control flow is shown as an arrow. Branches are shown as guard conditions on control flows or as diamonds with multiple labeled exit arrows. A fork or join of control is shown by multiple arrows entering or leaving a heavy synchronization bar. Figure 8-1 shows an activity diagram for processing an order by the box office.

For those situations in which external events must be included, the receipt of an event can be shown ...