Extension Points
An extension point is characterized by the following properties:
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An ID by which it can be referenced.
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An interface to be implemented by plug-ins. In most cases there is also an abstract base class available that implements the interface. It is recommended to extend this class for your own extensions.
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Names of properties to be provided by a plug-in.
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Optionally, it may be related / compared to a corresponding extension point offered in an Eclipse environment.
An extension point provides the name of a class that implements the interface and property values. In general, if there is an abstract base class, its usage is strongly encouraged.