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includeumlextend

UML use case diagram <<include>> and <<extend>>

To be specific, I have a base use case A, and two extended use case A1,A2. Then I add a "include" item to A, let's call it B. My question is will A1,A2 automatically include this item B? Or do I need to add two dotted arrows from A1,A2 to B?

I don't have enough score to post image here, so just use this picture to illustrate my idea, I'm missing to arrows from A to A1,A2, hope it doesn't confuse you.

                A ------> B(include)
               / \
        extend/   \extend
             /     \
            A1     A2

Thanks!

Solution

  • Indeed, if you are referencing B in A1 and A2 you will need to include (ElementImport in UML) B from them. But you can also have a Package containing A, A1 and A2 and import B from this Package, thus B will be available for all element within this Package.