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> Interesting to couple this with Abstract Patterns in Schematron 1.6 (the code for which
> has been released in dribs: I have promised an official release this week). Abstract
> patterns can be implemented as simple macros. The following Schema specifies which
> are required (a real schema would have more adventurous constraints.)
[SNIP]
How do I put this formally? You rock. This is wicked brilliant stuff.
Dou you have an XSLT implementation for this, yet? I'd guess you'd need EXSLT
(at least dyn:evaluate()) to make it work.
> <!-- AND ANOTHER FORMAT -->
> <sch:pattern name="SLR-table-format">
> <sch:param name="Camera" value="camera-table/data/row" />
> <sch:param name="ViewFinder" value="*[position()=../names/name[.="ViewFinder"]/position()" />
> <sch:param name="FocalLength" value="*[position()=../names/name[.="LensSize"]/position()" " />
> <sch:param name="Aperture" value="*[position()=../names/name[.="LensApperture"]/position()" " />
> <sch:param name="ShutterSpeed" value="*[position()=../names/name[.="ShutterSpeed"]/position()" " />
> </sch:pattern>
>
> </sch:schema>
This is exactly the sort of thing that I think could be simplified by a few
choice facilities in an XPath NG module. It seems too fundamentally
structural to be locked into such a brittle expression. But that
implementation note doesn't detract one bit from the beauty of the general
idea here. This is *exactly* the sort of genericity that I always go on about
when I criticize the rigidity of XSD's structural typing.
BTW, I see this approach as a complement rather than competition to OWL. I
would personally prefer to leave structural pattern description in something
like the above and leave OWL for formalization of the data dictionary and
abstract modeling of the problem space itself.
--
Uche Ogbuji Fourthought, Inc.
http://uche.ogbuji.net http://4Suite.org http://fourthought.com
Gems From the [Python/XML] Archives - http://www.xml.com/pub/a/2003/04/09/py-xm
l.html
Introducing N-Triples - http://www-106.ibm.com/developerworks/xml/library/x-thi
nk17/index.html
Use internal references in XML vocabularies - http://www-106.ibm.com/developerw
orks/xml/library/x-tipvocab.html
EXSLT by example - http://www-106.ibm.com/developerworks/library/x-exslt.html
The worry about program wizards - http://www.adtmag.com/article.asp?id=7238
Use rdf:about and rdf:ID effectively in RDF/XML - http://www-106.ibm.com/develo
perworks/xml/library/x-tiprdfai.html
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