Actually, that stuff is NOT part of SDD, it is part of the (discussion suspended? defunct? certainly out of date) UBIF. See http://www.diversitycampus.net/Projects/TDWG-SDD/Minutes/2004NZ_schema/DocuO...
Of course, part of the "you need the schema" defect of XML is that URIs alone without resolution won't let you validate the schema against the schema-for-schemas. A sane validating parser will always do this, because validating against an invalid schema is likely to leave you with instance documents claimed to be valid, but which break schema-driven tools that depend on "schema" meaning "valid schema". One doesn't encounter this very much if one is handcrafting, instead of generating, XML applications against a particular schema because one (dangerously) works to the particular schema, and so much about XML instances documents don't depend on validity. [In particular, it's about as easy to write silly code to work against silly XML as it is to write the silly XML in the first place]
Bob
Roderic Page wrote:
Dear Gregor.
[...] For SDD, well I'd be inclined to go for RDF, and keep it as lightweight as possible by referring to things like taxa, publications, images using URIs. My sense from looking at SDD is that it is enormously complex, partly because it tries to include far more information than it needs to (why does it need to know about people, telephone numbers(!), publications, etc. -- these can all be dealt with by other vocabularies and referred to by URIs). Why not have a core that covers what SDD is actually about?
Professor Roderic D. M. Page Editor, Systematic Biology DEEB, IBLS Graham Kerr Building University of Glasgow Glasgow G12 8QP United Kingdom
Phone: +44 141 330 4778 Fax: +44 141 330 2792 email: r.page@bio.gla.ac.uk web: http://taxonomy.zoology.gla.ac.uk/rod/rod.html reprints: http://taxonomy.zoology.gla.ac.uk/rod/pubs.html
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