However, if i don't know the prefix???
--
Cong Wang
Sent with Sparrow (http://www.sparrowmailapp.com/?sig)
On Wednesday, July 11, 2012 at 5:33 PM, Andy Seaborne wrote:
> On 11/07/12 17:19, Dave Reynolds wrote:
> > On 11/07/12 16:26, Cong Wang wrote:
> > > Hi all,
> > >
> > > ex:car1 rdfs:subClassOf ex:SportsCar .
> > >
> > > Suppose the sparql query is
> > >
> > > select ?x
> > > where {
> > > ?x ?y ?z .
> > > }
> > >
> > > while, I want to get "ex:car1" as a string, then i use str(?x),
> > > however it returns "http://.…./ex#car1";, with prefix..I just want
> > > "ex:car1". Besides, using afn:namespace or afn:localname doesn't work
> > > as well….
> > >
> > > Anyone knows how to do that?
> >
> > If you are doing this in java over a local model then take the result
> > from and do:
> >
> > model.shortform( valueOfX )
> >
> > If you have to do this directly in standard SPARQL then you could use
> > REPLACE to manipulate the string, maybe something like:
> >
> > SELECT (REPLACE(STR(?x), "^http://.../ex#";, "ex:") AS ?prefixed) ...
> >
> > Dave
>
> The trick in SPARQL is to use ex: as a prefix name to get its expansion
> and change the URI string.
>
> REPLACE(STR(?x), str(ex:), "ex:")
>
> :-)
>
> - - - - - -
>
> PREFIX ex: <http://example/>
>
> SELECT *
> {
> BIND(<http://example/local> as ?x)
> BIND(REPLACE(str(?x), str(ex:), "ex:") as ?y)
> }
>
>
> sparql --data D.nt --query Q.rq --results tsv
> ==>
> ?x ?y
> <http://example/local> "ex:local"
>
>
> Andy
