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Why can a stereotype extend a stereotype in profile in papyrus [message #1849116]

Tue, 04 January 2022 16:04

Jingliu Xiong

Messages: 14
Registered: August 2021

Junior Member

A stereotype cannot be used by itself, but must always be used with one of the metaclasses it extends. Stereotype cannot be extended by another stereotype in UML doc. But in Papyrus, it can.
Btw, does the import of metaclass only support the import of metaclass in UML?

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Re: Why can a stereotype extend a stereotype in profile in papyrus [message #1849117 is a reply to message #1849116]

Tue, 04 January 2022 16:26

Carsten Pitz

Messages: 495
Registered: May 2015
Location: Germany

Senior Member

Hi,
I am not aware of any constraint stated within the OMG UML 2.5.1 specification, that forbids a stereotype to extend another stereotype, what does not imply no such contraint exits.
So can you please cite the text fragment you refer to?
On that base we can base further discussion.
/Carsten

[Updated on: Tue, 04 January 2022 16:35]

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Re: Why can a stereotype extend a stereotype in profile in papyrus [message #1849119 is a reply to message #1849117]

Tue, 04 January 2022 19:20

Ed Willink

Messages: 7670
Registered: July 2009

Senior Member

Hi

Stereotypes would be very very limiting if inheritance was not available to support polymorphic families of behavior. I think you have misread something.

Regards

Ed Willink

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Re: Why can a stereotype extend a stereotype in profile in papyrus [message #1849122 is a reply to message #1849117]

Wed, 05 January 2022 01:52

Jingliu Xiong

Messages: 14
Registered: August 2021

Junior Member

When I use a tool called starUml, I find stereotype can not be extended by stereotype. I am reading uml 2.5.0 doc now.
This is a ref indicates that stereotype cannot be extended by stereotype.
https://www.uml-diagrams.org/stereotype.html#:~:text=Stereotype%20cannot%20be%20extended%20by,for%20the%20extended%20model%20element.

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Re: Why can a stereotype extend a stereotype in profile in papyrus [message #1849123 is a reply to message #1849119]

Wed, 05 January 2022 01:53

Jingliu Xiong

Messages: 14
Registered: August 2021

Junior Member

I think it should be extended, too. I am reading realted doc now.

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Re: Why can a stereotype extend a stereotype in profile in papyrus [message #1849144 is a reply to message #1849123]

Wed, 05 January 2022 10:19

Ansgar Radermacher

Messages: 470
Registered: March 2011
Location: Paris Saclay, France

Senior Member

A stereotype may not extend another stereotype (but generalization is possible, as Ed pointed out). If you validate such a profile with Papyrus, you get an error [1]. It can be discussed whether the tool should prevent you to create an invalid relationship (I tend to say yes) or the current permissive behavior with a validation error afterwards is ok.

[1] Error The opposite features 'metaclass' of '<Extension> E_StaticClassifier_Synchronized53' and 'extension' of '<Stereotype> Synchronized' do not refer to each other <Extension> E_StaticClassifier_Synchronized53 TestProfile EMF Problem

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