XML ids and XSL keys
ldodds at ingenta.com
Tue Oct 19 15:09:30 BST 1999
I've been working on a DTD recently, and rejected the use of
ID and IDREF definitions for cross-referenced attributes largely
because of the reasons outlined in the XSL spec (12.2 Keys) -
IDs just don't seem to be flexible enough for all purposes.
XSL defines the xsl:key element which mitigates these
limitations by providing links between elements which
are not defined as ID/IDREF pairs.
My questions then (if anyone has the time to answer them :) are
1. what are the historic reasons for the current definition of
2. are there ever likely to be any plans to allow the definition
of attributes in a similar way to XSL keys - i.e. 'ensure that
this attribute has a unique value within the set of elements having
that attribute in the document'.
3. or is it that no-one has so far need this kind of functionality
at the document validation level - is it in fact something which should
be dealt with at the application level?
4. or have I missed something along the way in RDF/Schemas/...?
Thanks for any responses.
"Never Do With More, What Can Be Achieved With Less"
---William of Occam
Leigh Dodds Eml: ldodds at ingenta.com
ingenta ltd Tel: +44 1225 826619
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