- From: Sean Bechhofer <sean.bechhofer@manchester.ac.uk>
- Date: Wed, 22 Oct 2008 12:55:51 +0100
- To: Peter F. Patel-Schneider <pfps@research.bell-labs.com>
- Cc: public-swd-wg@w3.org, public-owl-wg@w3.org
Dear Peter Thank you for your comments [1,2,ISSUE-156]: One portion of SKOS (Notations) uses custom datatypes. Although these seem to be benign, because RDF and OWL allow extra datatypes, the use of these datatypes is not likely to be supported by many tools. The presence of extra datatypes is likely to cause difficulties in some tools, which may just reject SKOS documents that have these datatypes. From Peter Patel-Schneider [2]: The OWL WG notes that one portion of SKOS (Notations) uses custom datatypes. Although these seem to be benign, because RDF and OWL allow extra datatypes, the use of these datatypes is not likely to be supported by many tools. The presence of extra datatypes may cause difficulties in some tools, which may just reject SKOS documents that have these datatypes. ------------------------------------------------------------- With respect to your comment regarding extra datatypes, the OWL Ontology reference document [3] states: [[ Tools may vary in terms of support for datatype reasoning. As a minimum, tools must support datatype reasoning for the XML Schema datatypes xsd:string and xsd:integer. OWL Full tools must also support rdf:XMLLiteral. For unsupported datatypes, lexically identical literals should be considered equal, whereas lexically different literals would not be known to be either equal or unequal. Unrecognized datatypes should be treated in the same way as unsupported datatypes. ]] Thus we would not expect applications to *reject* SKOS documents containing unsupported datatypes. The Working Group propose to make no change to the document in response to this comment and close this issue. We hope that you are able to live with this. Cheers, Sean Bechhofer Alistair Miles [ISSUE-156] http://www.w3.org/2006/07/SWD/track/issues/156 [1] http://lists.w3.org/Archives/Public/public-swd-wg/2008Oct/0018.html [2] http://lists.w3.org/Archives/Public/public-swd-wg/2008Oct/0059.html [3] http://www.w3.org/TR/owl-ref/#DatatypeSupport -- Sean Bechhofer School of Computer Science University of Manchester sean.bechhofer@manchester.ac.uk http://www.cs.manchester.ac.uk/people/bechhofer
Received on Wednesday, 22 October 2008 11:57:26 UTC