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3.3 The Class Diagram
FIGURE 3-22
Example for data types.
class Data types
?«datatype?»
Current
?«primitive?»
Integer
?«enumeration?»
ExtendedControlValue
i:Ampere
u:Volt
enable
disable
suspend
resume
Defi nition
An association class unifies the properties of an association and of a class.
In UML, associations are more than people normally think. An association is
not an alternative representation for attributes, but an independent element.
An association as a relationship between classes can have properties itself. This is
particularly striking with the association class.
An association class is denoted like an association and a class, where the class
is connected with the association by a dashed line ( Figure 3.23 ). The objects of
164 CHAPTER 3 UML??”Unifi ed Modeling Language
an association are called links . Accordingly, the objects of an association class are
referred to as link objects .
3.4 The Composite Structure Diagram
This section discusses a diagram form of UML 2 that was not around in UML 1:
composite structure diagrams.


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