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What is difference between extension point and variation point in feature modeling in software product line?

What is difference between extension point and variation point in feature modeling in software product line?

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Extension point:

  • An extension point is a formal declaration in a plugin. xml file where customization is allowed. Customization takes the place of other plug-ins (inclusive) providing a little chunk of XML describing the specific customization that is requested.

Variation point:

  • Specific location at a process where situational factors are evaluated and changes to the standard process are applied.
  • A point in a model (or other artifact) where a choice needs to be made between multiple possible variants. This choice is made during the configuration of the model.
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