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Defining associations
102
Visibility
The visibility of an association refers to the way in which it can be seen by
other objects. An association that is visible to another object may influence
the structure or behavior of the object, or similarly, its own properties may be
affected by the other object.
Property Visible
Private Only to the association itself
Protected Only to the association and its inherited objects
Package To all objects contained within the same package
Public To all objects
Aggregation/composition of an Association
You can define one of the roles of an association as being either an
aggregation or a composition in the Aggregation/composition group box.
Property Description
Aggregation An form of association that specifies the relationship between two
classes of the same level
Composition A form of aggregation of an association in which the class attached
to the association role may be a part of only one composite at a time
Container Specifies which of the two roles is an aggregation or a composition
Indicator Indicates that the association is an aggregation or a composition
Changing an association into an associative class
You can transform an association into an associative class linked by two
associations. Next, you can attach class attributes to this associative class,
that you could not attach to the association.
The associative class gets the name and code of the association. You can
define cardinality properties for each of the two associations created between
the new class and the two existing classes.
v To change an association into an associative class:
1 Right-click an association.