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Good morning!
What is the difference between these two terms and their use in the use case diagram?
I already know the concept of extension, but I didn’t understand the relationship between the two.
Extension Relationship - according to IBM
Extension Points - according to IBM
If you can present an example diagram presenting the two concepts in it, I’d like to thank you.
Sincerely yours,
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The difference is what extent point defines a particular state, condition or prerequisite for the extension to happen.
While the extension happens when a use case is completed, the extension point happens in a given situation (state, condition, etc).
The figure below (from the link http://www.uml-diagrams.org/use-case-extend.html) illustrates this very well:
It indicates that, the use case "Get Help On Registration" only occurs at the point "Registration Help", that is, when the user clicks on the Help link for example. This illustrates in the diagram that the extension occurs in a given situation.
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