mapping SQL datatypes to XDM

The XML Schema datatype spec was informed largely by SQL-heads in
XQuery, giving us pretty good confidence that SQL's expressivity needs
are well-met by XML. Per
http://www.w3.org/TR/2004/REC-rdf-concepts-20040210/#section-use-xsd
RDF (and SPARQL, OWL, etc) defer to XDM datatypes. I expect that a
survey of SQL data types would be redundant with work done by XML
Schema and ISO. Instead, I think we should keep our eyes open, and
report any missing datatypes to the ISO SQL group for inclusion in the
upcoming ISO SQL spec §9.5 (attached) for "Mapping SQL data types to
XML Schema data types". If we do find it necessary to use this spec to
complement XDM, then we could cite it normatively in our output.

/me hands issue to JimM...
-- 
-ericP