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12 . You can recognize a derived association by the slash
before the name of the association. This association is actually superfl uous in this
context because it results from the other two associations in the diagram. A usage
data object can reach the car object through its customer object. This is the reason
why the association is referred to as ??? derived. ??? It emphasizes the indirect relationship
between usage data and car . Derived associations are used mainly in
analysis models, for example in the domain class model.
Associations are used not only between classes, but also between actors and
use cases, or between actors and the system ( Figure 3.13 ). We are talking about the
same model element. The different forms of uses are supported in UML by default.
3.3.5 Aggregation and Composition
FIGURE 3-12
A derived association.
7 The concepts navigability and owning properties were split apart in UML 2.1.1 [48].
3.3 The Class Diagram
class Derived association
Customer
customer
0..1
Usage data
carUsed 0..1
I
0.


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