- From: Dan Connolly <connolly@w3.org>
- Date: 19 Dec 2002 10:04:16 -0600
- To: www-xml-schema-comments@w3.org
- Cc: www-webont-wg@w3.org, www-rdf-comments@w3.org
The Web Ontology Working group has a requirement... "R9. Data types The language must provide a set of standard data types. These data types may be based on XML Schema data types." -- http://www.w3.org/TR/2002/WD-webont-req-20020708/#section-requirements In working out a design for this requirement, we found it straightforward, with a few exceptions, to integrate the built-in datatypes, since the XML Schema spec gives them URIs. The exceptions were types like QName, which don't fit the mold of a lexical space of strings with an unambiguous mapping to values. I raised this issue a while ago... QName is ambiguous; aren't datatypes unambiguous? union types total? From: Dan Connolly (connolly@w3.org) Date: Fri, Aug 02 2002 http://lists.w3.org/Archives/Public/www-xml-schema-comments/2002JulSep/0056.html But the XML Schema spec doesn't give URIs for types like "integers between 10 and 20", i.e. derived datatypes. A precursor to OWL, DAML+OIL, used schemadoc#typename to refer from ontologies to datatypes; e.g. to constrain the range of a property. [hmm... where is that documented? I can't find it.] But the XML Schema spec doesn't specify that URIs of that form refer to datatypes, so we don't think it's best to include that mechanism in our design at this time. We understand the XML Schema WG is working on a design for URIs for user-defined datatypes. If the design you're working on will be compatible with the simple schemadoc#typename syntax, please let us know, and we'll use that. But we understand it's likely to be different (because of the difference between schema documents and schemas, the different kinds of names in schemas, etc.) so we're leaning toward postponing (part of) this issue 'till the next version of OWL. http://www.w3.org/2001/sw/WebOnt/webont-issues.html#I5.8-Datatypes The case of URIs for user-defined datatypes is, perhaps, a specific case of the general issue of URIs for schema components... TAG interested in progress on URIs for schema components (NUNs) From: Dan Connolly (connolly@w3.org) Date: Thu, Oct 17 2002 http://lists.w3.org/Archives/Public/www-xml-schema-comments/2002OctDec/0011.html -- Dan Connolly, W3C http://www.w3.org/People/Connolly/
Received on Thursday, 19 December 2002 11:04:19 UTC