- From: Ivan Herman <ivan@w3.org>
- Date: Tue, 4 Sep 2012 19:38:27 +0200
- To: Dan Brickley <danbri@danbri.org>
- Cc: Antoine Zimmermann <antoine.zimmermann@emse.fr>, "public-rdf-comments@w3.org" <public-rdf-comments@w3.org>, "richard@ex-parrot.com" <richard@ex-parrot.com>
Dan, the question is of course justified, but I should also add that, in fact, very very few people use xmls schema datatype definitions together with RDF, too. In both cases the difficulty is identical: to understand and process those datatypes an external 'tool' has to be brought in: either an xml schema or an owl processor... Mainly in a non-XML RDF world (ie, as Richard said, with a diminishing usage of RDF/XML) the chance of using XML schema based derived datatypes is getting smaller and smaller in my view. I find the OWL 2 datatype definition possibilities one of the most interesting and potentially important part of OWL 2. I actually wish the relevant part of the specification was also made more known and possibly used in isolation; at present it is burried in the overall OWL 2 spec, which is of course not an easy read... (Maybe it is worth some extra blog/note) Ivan --- Ivan Herman Tel:+31 641044153 http://www.ivan-herman.net (Written on mobile, sorry for brevity and misspellings...) On 4 Sep 2012, at 15:37, Dan Brickley <danbri@danbri.org> wrote: > On 4 September 2012 21:11, Antoine Zimmermann > <antoine.zimmermann@emse.fr> wrote: >> FWIW, OWL 2 has a feature to define custom datatypes that can be written >> completely in RDF, without using XML Schema. >> >> Your example for Chapman codes can be written as follows, in Turtle syntax: >> >> @prefix geo: <http://www.example.com/geo#> >> @prefix xsd: <http://www.w3.org/2001/XMLSchema#> >> @prefix owl: <http://www.w3.org/2002/07/owl#> >> @prefix rdfs:<http://www.w3.org/2000/01/rdf-schema#> >> >> geo:chapman-code a rdfs:Datatype; >> owl:equivalentClass [ >> a rdfs:Datatype; >> owl:onDatatype xsd:string; >> owl:withRestriction ( [xsd:pattern "[a-zA-Z]{3}"] ) >> ] . > > Interesting! Are many of these showing up "in the wild" yet? > > Dan >
Received on Tuesday, 4 September 2012 17:38:54 UTC