uml - Associations between actors and usecases in the UML2 Metamodel -


i'm trying understand rules defined uml2 metamodel associations between actors , usecases in usecase diagrams. understand actors , usecases can take part in generalizations (because derived classifier adds possibility generalization), , understand usecase can have extend/include-relationships other usecases (because directly defined in specification usecase diagrams). here part of metamodel diagram usecases:

enter image description here

as can see, there no associations between actors , usecases @ in diagram. can mean associations allowed due common supertype of actor , usecase, perhaps behavioredclassifier or classifier. question is:

  • which of meta(-classes) or elements in metamodel hierarchy responsible associations between actors , usecases?

another thing confusing: there constraint says:

an actor can have associations use cases, components, , classes. furthermore these associations must binary.

but there no equivalent constraint defined usecases (except binary thing). mean associations belong actors , usecases not aware of associations towards actors? specification can found here, thanks.

the metaclasses responsible associations between actors, usecases, classes, component, etc. association , property. when associated actor usecase, 3 elements involved: association , 2 properties. association none directed relation between elements (classes, components, etc.) properties represent "ends" of association , association binary if has 2 ends.

hoping helps


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