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On what base XMI id are created ? [message #859535]

Fri, 27 April 2012 17:32

Alain Lavoie

Messages: 82
Registered: April 2012

Member

Hi,

I am about to rely on the XMI id of each UML element.
As an example, a model.uml can contain the following line:
<packagedElement
xmi:type="uml:Class"
xmi:id="_cLKC8I12EeGTScm55cHSZg"
name="MyClass">

I wish to understand on what base, Papyrus calculate the
precedent key (_cLKC8I12EeGTScm55cHSZg) ?

My guess is that Papyrus uses this key to propagate this uml elements changes.
Therefore, I imagine it is created once and stays the same
even when the class (here "MyClass") is renamed (like into "MyOtherClass").

My guess is that it is unique across time, model, package organisation, ...
BUT based on what algorithm ?

A lot of guess...

Can somebody in-light me ?

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Re: On what base XMI id are created ? [message #860584 is a reply to message #859535]

Sat, 28 April 2012 05:25

Ed Merks

Messages: 33137
Registered: July 2009

Senior Member

Alain,

No doubt they're using EcoreUtil.generateUUID. Most likely they've
specialized their resource implementation to make
XMLResourceImpl.useUUIDs return true. And yes, EMF makes sure this
UUID is universally unique and its associating with the instance will
even be preserved when the instance is moved between resources.

On 27/04/2012 7:32 PM, Alain Lavoie wrote:
> Hi,
>
> I am about to rely on the XMI id of each UML element.
> As an example, a model.uml can contain the following line:
> <packagedElement xmi:type="uml:Class"
> xmi:id="_cLKC8I12EeGTScm55cHSZg" name="MyClass">
>
> I wish to understand on what base, Papyrus calculate the precedent key
> (_cLKC8I12EeGTScm55cHSZg) ?
>
> My guess is that Papyrus uses this key to propagate this uml elements
> changes.
> Therefore, I imagine it is created once and stays the same
> even when the class (here "MyClass") is renamed (like into
> "MyOtherClass").
>
> My guess is that it is unique across time, model, package
> organisation, ...
> BUT based on what algorithm ?
>
> A lot of guess...
>
> Can somebody in-light me ?
>
>
>

Ed Merks
Professional Support: https://www.macromodeling.com/

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