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The control operator itself is an activity
in this example ( Figure 4.56 ). The control operator has an output pin, which is
normally not represented. It is shown in Figure 4.50 for better understanding.
4.8 The Activity Diagram
FIGURE 4-48
Function tree for ???start car usage.???
bdd [package] Start car usage [function tree]
?«activity?»
Start car usage
?«activity?»
Identify customer
?«activity?»
Check usage right
?«activity?»
Request usage right
?«activity?»
Unlock car
0..1
0..1
0..1
0..1
0..1
0..1
0..1
0..1
0..1
0..1
?«activity?»
Check disposal right
?«activity?»
Start car usage
?«activity?»
Activate car
?«activity?»
Confirm usage start
?«activity?»
Cancel usage start
?«domain?»
Customer
260 CHAPTER 4 SysML??”The Systems Modeling Language
In contrast, the subsequent action requires an input pin as well. It is a control
pin, which is not normally shown either. This means that it is no longer visible at
a glance whether or not it is a control fl ow or an object fl ow. The control pin at
the action show car usage data in Figure 4.


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