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OCL as query language for UML models? [message #794903]

Thu, 09 February 2012 21:05

Michael Bob

Messages: 29
Registered: February 2012

Junior Member

Hi,

I wanna formalize some queries based on models as XMI created using the UML2 Tools. Is OCL the right tool for this? For example to get the number of classes within my model. Or should I use some part of QVT (Q = Query)?

Or is there another query language for UML models based on Ecore/XMI?

Regards,

Michael

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Re: OCL as query language for UML models? [message #794910 is a reply to message #794903]

Thu, 09 February 2012 21:17

Ed Willink

Messages: 7655
Registered: July 2009

Senior Member

Hi

I would use OCL, but some people might prefer Query/Query2.

QVTo extends OCL for trransformations so QVTo is over the top.

Regards

Ed Willink

On 09/02/2012 21:05, Michael Gebhart wrote:
> Hi,
>
> I wanna formalize some queries based on models as XMI created using
> the UML2 Tools. Is OCL the right tool for this? For example to get the
> number of classes within my model. Or should I use some part of QVT (Q
> = Query)?
>
> Or is there another query language for UML models based on Ecore/XMI?
>
> Regards,
>
> Michael

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Re: OCL as query language for UML models? [message #794917 is a reply to message #794910]

Thu, 09 February 2012 21:32

Michael Bob

Messages: 29
Registered: February 2012

Junior Member

Ah ok, great, thanks.

Just for my interest: What is Query/Query2? An OMG standard?

Regards,

Michael

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Re: OCL as query language for UML models? [message #795146 is a reply to message #794917]

Fri, 10 February 2012 05:51

Axel Uhl

Messages: 41
Registered: July 2009

Member

Query/Query2 are EMF query languages / APIs, where query2 is the renovated, somewhat SQL-like approach that is trying to let you work on more or less abstract "scopes" whereas the former EMF query API required you to start searching in a set of EMF objects already loaded into a ResourceSet which makes it rather impractical for querying large EMF repositories.

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