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3.5 Relationship

Generate one more class Gebaeude.

Using the tool PIC ([8], Kap. 3.4.1) generate a relation between the two classes BoFlaechen and Gebaeude, by clicking the class BoFlaechen and pulling the mouse cursor (keep on pressing the left mouse button) over to the class Gebaeude (release the left mouse button). You have now generated a relationship between the two classes (Fig. 3.8). Assign any name to the relation (in our exemple GebaeudeFlaeche).


PIC
Figure 3.8A relationship between two classes.


In the specification dialog ([8], Kap. 4.2.11) of the two roles (Fig. 3.9) you can modify your names. For one of the roles enter the name Flaeche and for the other the name Gebaeude .


PIC
Figure 3.9Specification dialog for a role.


In the corresponding roles it is also possible to modify the cardinality (Fig. 3.10). Select the value 1 for the role Flaeche and the value 0..* for the role Gebaeude.


PIC
Figure 3.10How to modify cardinality.


By positioning the mouse cursor above a role (end of the relationship), the relationship can be converted into a composition by means of the context menu (Fig. 3.11).


PIC
Figure 3.11Context Menu of a Role.


In order to define further properties of the relationship, you can mark the relationship and open the specification dialog ([8], Kap. 4.2.9).

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