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Self generalization [message #1739716]

Thu, 04 August 2016 08:54

Fay Florian

Messages: 1
Registered: August 2016

Junior Member

Hi together,

is it possible to display a self generalization in Papyrus UML?

I wasn't able to do this.

Thanks for your answers.

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Re: Self generalization [message #1739922 is a reply to message #1739716]

Fri, 05 August 2016 17:12

Carsten Pitz

Messages: 479
Registered: May 2015
Location: Germany

Senior Member

Hi,

well, the UML 2.5 specification -- as I interpret it -- allows self generalization. Neither the Generalization it itself nor the generalzation DirectedRelationship and the generalzation of the DirectedRelationship the Relationship own a rule imposing restrictions on it.

But, what is self generalization good for?
Or the other way round: What is the use case?

/Carsten

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Re: Self generalization [message #1741995 is a reply to message #1739922]

Fri, 05 August 2016 19:04

Ed Willink

Messages: 7655
Registered: July 2009

Senior Member

Hi

UML may not explicitly prohibit self-generalization, but the class name
will be ambiguous and certainly any attributes will be.

Regards

Ed Willink

On 05/08/2016 18:12, Carsten Pitz wrote:
> Hi,
>
> well, the UML 2.5 specification -- as I interpret it -- allows self
> generalization. Neither the Generalization it itself nor the
> generalzation DirectedRelationship and the generalzation of the
> DirectedRelationship the Relationship own a rule imposing restrictions
> on it.
>
> But, what is self generalization good for?
> Or the other way round: What is the use case?
>
> /Carsten

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Re: Self generalization [message #1742879 is a reply to message #1739922]

Thu, 08 September 2016 12:09

Perdita Stevens

Messages: 18
Registered: September 2016

Junior Member

UML2.5 does still prohibit self-generalization. The constraint is under Classifier, section 9.9.4.8, on p176 of the PDF.

no_cycles_in_generalization
Generalization hierarchies must be directed and acyclical. A Classifier can not be both a transitively general
and transitively specific Classifier of the same Classifier.
inv: not allParents()->includes(self)

Phew Smile