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On Mon, 6 Dec 1999, Andrew Layman wrote: > 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 agree. There are probably many ways to express mappings. One candidate is > shown at the end of the "Schemas NG" paper. See > http://www.lindamann.com/xml/XML%20Schemas%20NG%20Guide%20HTML.htm, and look > for the section titled "Mapping to Other Data Models." This is interesting work, though it's unclear quite how it fits in with the Canonical Format / Serializing Graphs paper. The 'Mapping to Other Data Models' section of 'Schemas NG' shows one strategy for annotating schemas to support directed labelled graph interchange in XML. It would be good to see these two strategies drawn together in a single document describing objects'n'properties DLG serialization strategies for XML applications. By drawn together I mean having a common documented model for the DLG representation rather than informal prose. It is clear by now that the RDF 1.0 Syntax doesn't cut it as the One True Graph Serialization for all XML applications. I don't think anybody expected otherwise, but we now have general consensus [eg. 1] that a more broadly usable DLG exchange syntax is needed by RDF apps. We have two proposals already floated on the RDF Interest Group for alternate DLG-interchange syntaxes [2, 3] and their aims seem to be basically the same as [4,5]: DLG interchange in XML. It is also clear that a lot of (RDF-agnostic) XML data interchange apps want to ship directed labelled graphs around using non-stilted XML syntaxes. I've argued elsewhere [7] that these graphs will often want to use URIs for edge types, node identifiers and node types in all but tightly-coupled closed environments. My hope is that XML-DEV and the RDF Interest Group[6] will come up with implementation-led proposals for XML DLG-interchange that both complement the XML Schema work (for mapping-based proposals) and fit with colloquial (ie. mainstream) XML conventions (for serialisation syntaxes). There's a bunch of interest in an improved syntax for RDF graph serialization, and growing interest in more general XML DLG interchange strategies layered on top of XML + XML Schemas. I have a hard time thinking of these as different problems, hence my wish that the DLG model mentioned in the schemas NG and canonical papers be documented a bit more formally to aid comparison with similar proposals for a better RDF syntax... Dan Refs: [1] http://www.w3.org/TR/1999/NOTE-schema-arch-19991007 (s3.8) [2] http://lists.w3.org/Archives/Public/www-rdf-interest/1999Nov/0066.html [3] http://lists.w3.org/Archives/Public/www-rdf-interest/1999Nov/0100.html [4] http://www.biztalk.org/Resources/canonical.asp [5] http://www.lindamann.com/xml/XML%20Schemas%20NG%20Guide%20HTML.htm#_ftn4 [6] http://www.w3.org/RDF/Interest/ [7] http://www.lists.ic.ac.uk/hypermail/xml-dev/xml-dev-Dec-1999/0121.html 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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