How to query UML models with OCL?

Hello everyone,
I am working on using OCL to query UML models.
Besides diverse examples, I don't know how certain UML metamodel elements are accessed via OCL when an instance model is given.
Where am I supposed to look after this information?

Hi
Perhaps you want
Transition.allInstances().extension_ensureRole->excluding(null).role
Regards
Ed Willink
On 17/07/2015 10:58, Jens Bürger wrote:
> Thanks,
>
> so for now I will use Mars.
>
> I managed to get close to what I want in a first test case.
> I have a state chart and a transition with a stereotype <<ensureRole>>.
> This stereotype has a tagged value "role" which is represented as a
> String array. The actual only element is "a=b".
>
> I use the following query:
> Transition.allInstances()->select(t |
> t.getAppliedStereotypes().name->includes('ensureRole')).getAppliedStereotypes().getAllAttributes()->select(x|x.name='role')
>
> The result is:
> ensureRole::ensureRole::role
>
> So how can I access the tagged values?
> The respective part of the .uml-file looks like this:
>
> ..
> </uml:Model>
> <ensureRole:ensureRole xmi:id="_e75g0Cu0EeWNw6GF_Fgubg"
> base_Transition="__AaxQIRzEeSbXcAiNcJFPQ">
> <role>a=b</role>
> <role>x=y</role>
> </ensureRole:ensureRole>
> </xmi:XMI>
>
>

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