- From: Axel Polleres <axel.polleres@deri.org>
- Date: Thu, 10 Jul 2008 10:39:50 +0100
- To: Bijan Parsia <bparsia@cs.man.ac.uk>
- CC: "Phillips, Addison" <addison@amazon.com>, Dan Brickley <danbri@danbri.org>, Sandro Hawke <sandro@w3.org>, Jie Bao <baojie@cs.rpi.edu>, "OWL 1.1" <public-owl-wg@w3.org>, "public-i18n-core-comments@w3.org" <public-i18n-core@w3.org>, public-rif-comments@w3.org, public-webont-comments@w3.org
Bijan Parsia wrote: > (too many lists! :)) > > I'd like to raise a point that Dan Brickley (cced) often champions. If > it's more appropriate in a narrower scope, please narrow it for me! > > In some applications, like FOAF, it's common to compare as equal two > strings with different language tags (esp. for such purposes as being a > database key like identifier). I can think of several ways to do this > (e.g., always comparing the strings and opting in to distinguishing the > languages), but I thought I'd raise the issue. > > Cheers, > Bijan. Well, with the built-in functions in DTB [1]... you should be able to do so, there are functions for extracting the string: by casting rif:text to xs:string [2]) as well as extracting the lang-tag (by adopting SPARQL's lang function [3]. Note that the former would be even easier with the langtag-as-dataype proposal, and for the latter, we'd need a function which returns the datatype of a literal... we have to discuss this, since sparql's datatype function [4] is not straightforwardly applicable to RIF semantically... at least there are some implications in defining it, I guess. Axel 1.http://www.w3.org/2005/rules/wiki/DTB 2.http://www.w3.org/2005/rules/wiki/DTB#xs:string 3.http://www.w3.org/2005/rules/wiki/DTB#func:lang_.28adapted_from_SPARQL.27s_lang_function.29 4.http://www.w3.org/TR/rdf-sparql-query/#func-datatype -- Dr. Axel Polleres, Digital Enterprise Research Institute (DERI) email: axel.polleres@deri.org url: http://www.polleres.net/ Everything is possible: rdfs:subClassOf rdfs:subPropertyOf rdfs:Resource. rdfs:subClassOf rdfs:subPropertyOf rdfs:subPropertyOf. rdf:type rdfs:subPropertyOf rdfs:subClassOf. rdfs:subClassOf rdf:type owl:SymmetricProperty.
Received on Thursday, 10 July 2008 09:40:42 UTC