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6.2 Action and PIN
3.6 The Activity Diagram
FIGURE 3-39
Example for input and output pins.
act Start car usage (section)
Car
Identify
customer
Check usage right
Usage right
Customer
Defi nitions
An action is an elementary executable step in an activity.
A pin is the connecting link between the parameters of an action and the
object fl ow. We distinguish between input pin and output pin.
An action is elementary and executable. UML already defines all actions, so that
they are independent of a special domain. Modeling tools can implement these
actions and make them available in a runtime environment.
The notation for an action is a rectangle with rounded corners. It ??™ s like the
notation for an activity, except that an action is not further decomposed. Several
predefi ned actions deviate from this standard notation, for example, the action for
sending a signal (see status display in Figure 3.42 ).
Actions consume data and can supply new data as a result. The data are transported
from and to actions by object tokens.


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