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The metaid data type is XML ID, and the definition of XML ID
only constrains what happens within a given XML document
instance.

Two different XML documents (whether they are two different
versions of the same model, or two differnet models) are two
different XML instances as far as IDs are concerned.

MH

>>>>> On 27 Apr 2010, Dagmar Waltemath <dagmar.waltemath@uni-rostock.de> wrote:
> Dear all, I have a question regarding the notion of the
> uniqueness of a metaID in an SBML document: Is the
> metaID necessarily unique in an SBML document and all
> its versions? Or is the uniqueness restricted to a
> particular SBML document (i.e. a version of an SBML
> document)?

> Looking into different model versions, we were wondering
> whether something like the following example is allowed
> to happen:

> model m1.0 <listOfSpecies>
> <species metaid="1" name="a" /> <species metaid="2"
> name="b" />
> </listOfSpecies> <listOfReactions />

> ... some changes on the model lead to the conclusion
> that actually species a is not needed for the model, so
> it is deleted:

> model m1.1 <listOfSpecies>
> <species metaid="2" name="a" />
> <listOfSpecies> <listOfReactions />

> ... some more evaluation suddenly detects that a
> reaction is missing in the model to work properly, so it
> is added:

> model m1.2 <listOfSpecies>
> <species metaid="2" name="a" />
> <listOfSpecies> <listOfReactions>
> <reaction metaid="1" name="c" />
> <listOfReactions />

> The question is: Is there something in the SBML spec
> saying that the newly created reaction in version 1.2
> cannot carry an ID that had been existing in a previous
> version of the model?

> If so, that would make keeping track of version changes
> far easier, so we would be happy if it was the
> case... although I am not sure how one would be able to
> control it. Nor who should do it - probably "it is a
> tool problem"...

> The only bit I found in the spec is: In SBML, type ID is
> the data type of the metaid attribute on SBase,
> described in Section 3.2. An important aspect of ID is
> the XML requirement that a given value of ID must be
> unique throughout an XML document.

> This does however not mention model versions.

> Thanks in advance for your comments, Dagmar

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