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OCL in Activity Diagram [message #1787195]

Mon, 21 May 2018 20:49

shah niaz

Messages: 1
Registered: May 2018

Junior Member

i have searched a lot about specifying OCL constraint in Activity Diagram.
How i will apply OCL constraints in UML Activity Diagram ?? as like we don for class diagram. there is a lot of help for class diagram but nothing for Activity Diagram

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Re: OCL in Activity Diagram [message #1787468 is a reply to message #1787195]

Fri, 25 May 2018 18:06

Ed Willink

Messages: 7655
Registered: July 2009

Senior Member

Hi

There is no explicit Eclipse OCL support for Activity Diagrams, but a couple of problems with generic support have been fixed.

Your question is vague and certainly gives no clue as to what you actually need to do.

An OCL constraint is a truth statement typically an invariant and as such does not really apply to an Activity Diagram. A Constraint applies to the classes that the Activity Diagram manipulates. and so would be better drawn on a Class Diagram.

An OCL Expression (confusing required to be formulated as Boolean-valued Constraint in UML) may be used wherever you need to enrich the graphical UML with a textual expression. I have never used an Activity Driagram, but I presume that just like State Machines, there are guards and output values that need computation by an OCL expression.

So once you can explain what you need to do, it may be possible to help you understand why your attempt to do so is failing.

Regards

Ed Willink

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