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Nested OCL forAlls [message #1703513]

Sun, 02 August 2015 00:31

Hamid Qartal

Messages: 33
Registered: December 2013

Member

I have the following Formula in First Order Logic.

    foAll a:A | forAll b :B | if a.r1=b then a.r2=b

simply, for all objects of type A, and for all objects of type B, if they are related by r1 then they are related by r2 as well. r1 and r2 are two association from A to B.

How this is written in OCL?

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Re: Nested OCL forAlls [message #1703518 is a reply to message #1703513]

Sun, 02 August 2015 09:13

Ed Willink

Messages: 6534
Registered: July 2009

Senior Member

Hi

A.allInstances()->forAll(a | B.allInstances()->forAll(b | a.r1=b implies
a.r2=b))

---

OCL 2.5 may accept that allInstances() is an unavoidably useful evil and
so allow

forAll(a : A, b : B| a.r1=b implies a.r2=b)

Regards

Ed Willink

On 02/08/2015 01:31, Hamid Qartal wrote:
> I have the following Formula in First Order Logic.
>
> foAll a:A | forAll b :B | if a.r1=b then a.r2=b
>
>
> simply, for all objects of type A, and for all objects of type B, if
> they are related by r1 then they are related by r2 as well. r1 and r2
> are two association from A to B.
>
> How this is written in OCL?
>
>
>

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