Association, Aggregation and Composition Property Pages |
The property pages for association, aggregation and composition links allow you to specify the multiplicity and navigability of each role. In addition, you can change the type of each role.
The following graphic shows the properties of the student role of the association between a School class and a Student class.
The role name is optional. Specify a role name if it will make your diagram clearer.
To the right of the role name, there is a button with ellipses on it. Use this button to map to another role that you've already defined in your project.
The role can have one of three types: association, composition or aggregation.
The multiplicity of a role indicates how many objects can participate in the relationship.
Use the navigability checkbox to indicate that a class has the responsibility for maintaining the relationship between the classes. In the example above, the school class has a responsibility for knowing which students attend.
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