Re: I18N issues an OWL2

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.