[Om] OMR xref vs href

Michael Kohlhase m.kohlhase at jacobs-university.de
Fri Jan 30 01:28:30 CET 2009

thanks for the notification, I have created an issue in the OM3 Trac
about this: https://trac.mathweb.org/OM3/ticket/104

@DAVID, we should think about issuing an erratum for this for OpenMath2.


David Carlisle wrote:
> Strange. I just spotted the same error (more or less) in the draft
> MathML3 spec last night, but didn't check that the error originated in
> the OM spec, where it has been unreported for some years.
>> One could deduce from the standard that xref could/should/must point to 
>> a local id, and href could/should/must be a URI,
> That does influence the choice of attribute names in the OM design, but
> I think what happened here was that during the course of the OM2
> development OMR changed from taking an IDREF to URI, and so the
> attribute changed from xref to href. The text and schema reflect that,
> but the examples do not (and are not valid).
> Embarassingly this means that the examples in the OM2 spec could not
> have been validated at the time, sorry about that.
> I think xref="foo" should be href="#foo".
> David
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 Prof. Dr. Michael Kohlhase,       Office: Research 1, Room 62 
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