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From: Matthew Gertner <matthew@p...> >Dan Brickley wrote: >> I believe it will be possible to annotate XML schemas with information >> for mapping into (generic or domain specific) application datamodels >> such as RDF. I don't think it is right to expect the hard-pressed XML >> Schema group to define all these mappings within that working group. ... > >I totally agree. As long as these considerations are being taken into >account, I'm sure there will be plenty of people experimenting with >various approaches. This will certainly lead to a better understanding >of how to address these issues than simply mandating something that was >worked out by a committee. In this vein, schematron-rdf at http://www.ascc.net/xml/resource/schematron/schematron.html generates RDF documents (currently with bogus XLinks, but you can customize it easily) based on Schematron schemas. In this case, the schema is not converted to RDF, rather the RDF shows which assertions in the schema apply to each element in the instance. This is a rather different use for schemas: as programs for automated annotation. The thing that became immediately clear from working on it was that RDF is good for arcs (relationships) but grammar-based schemas largely hide these relationships (between elements, attributes, data) behind a few generic but superficial types: containment, sequence, repetition. Schematron assertions now allow a "role" attribute, for labelling classes of arcs. I think developers of other schema languages might also consider this kind of thing too: that the connectors between particles of patterns (e.g., compositors in the content models in a grammar-based schema language) should have some role attribute (and documentation?) for labelling their significance. For example, if element A must be follwed by element B, to say why. The nodes that conventional schemas define (e.g. elements and attributes) are interesting, but the arcs between them can also be very interesting for automatic annotation using RDF. Rick Jelliffe xml-dev: A list for W3C XML Developers. To post, mailto:xml-dev@i... Archived as: http://www.lists.ic.ac.uk/hypermail/xml-dev/ and on CD-ROM/ISBN 981-02-3594-1 To unsubscribe, mailto:majordomo@i... the following message; unsubscribe xml-dev To subscribe to the digests, mailto:majordomo@i... the following message; subscribe xml-dev-digest List coordinator, Henry Rzepa (mailto:rzepa@i...)
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