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In the activity diagram we
use a special symbol to represent this. Though the receiver of the signal is not
denoted it is present in the model.
Note that we are no longer working on the essential level. The further we go
forward in the detailing process the more specifi c we describe a fl ow. In contrast
to the essential description, technical details are now not only permitted but
desired. Try to knowingly draw a border between pure domain things and technical
FIGURE 2-57
The decision ??? customer identifi ed? ???
act Start car usage [section]
?«essential?»
Identify
customer
[customer not identified]
[customer identified]
...
...
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solutions. We will be working exactly along this border in Section 2.8.1 to model
technical variants.
In the next step, we send a usage right request to the reservation system and
expect an answer. Of course, the waiting time has to be limited. We use an interruptible
activity area to model this in the activity diagram. A dashed rectangle
denotes the area within the activity that can be interrupted by an event.


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