A containment line is used to show, for example, parent-child relationships between two classes or two packages.
To illustrate containment between two classes:
|1.||Click the Containment toolbar button (in a class or package diagram).|
|2.||Drag from the class that is to be "contained", and drop on the container class.|
Note that the contained class, Engine in this case, is now visible in a compartment of Car. This also places the contained class in the same namespace as the container class.
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