Yep, unfortunately, I hit the same issue - check the bug database for the
project - it has a patch which helped me.
It seems like this project got abandoned by the maintainer - I'm even
thinking to switching to ARC ;(
Sergey
On Thu, Nov 13, 2008 at 7:59 PM, Josef Petrák <jsp...@gm...> wrote:
> Hello all,
>
> we have tried to run a query to load foaf:names of a foaf:Group class,
> in which each foaf:name has different lang. The name in English lang
> is always present, the name in Czech lang is optional. The data are
> here http://keg.vse.cz/demo-groups.rdf Our SPARQL select was the
> following one:
>
> PREFIX foaf: <http://xmlns.com/foaf/0.1/>
> PREFIX rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#>
> SELECT ?group ?nameEn ?nameCs
> WHERE {
> ?group rdf:type foaf:Group .
> ?group foaf:name ?nameEn .
> OPTIONAL { ?group foaf:name ?nameCs . FILTER (lang(?nameCs) = "cs")
> }
> FILTER (lang(?nameEn) = "en")
> }
>
> But using RAP engine, we got only resources, which have both names bound:
>
> Array
> (
> [0] => Array
> (
> [?group] => Resource Object
> (
> [uri] => http://keg.vse.cz/resource/group/KIZI
> )
> [?nameEn] => Literal Object
> (
> [label] => Department of Information and Knowledge
> Engineering
> [lang] => en
> [dtype] =>
> )
> [?nameCs] => Literal Object
> (
> [label] => Katedra informačního a znalostního
> inženýrství
> [lang] => cs
> [dtype] =>
> )
> )
> )
>
> If we used e.g. Virtuoso SPARQL query engine service, we have got both
> resources:
>
>
> http://dbpedia.org/sparql?default-graph-uri=http%3A%2F%2Fkeg.vse.cz%2Fdemo-groups.rdf&should-sponge=soft&query=PREFIX+foaf%3A+%3Chttp%3A%2F%2Fxmlns.com%2Ffoaf%2F0.1%2F%3E%0D%0APREFIX+rdf%3A+%3Chttp%3A%2F%2Fwww.w3.org%2F1999%2F02%2F22-rdf-syntax-ns%23%3E%0D%0ASELECT+%3Fgroup+%3FnameEn+%3FnameCs%0D%0AWHERE+%7B%0D%0A%09%3Fgroup+rdf%3Atype+foaf%3AGroup+.%09%0D%0A%09%3Fgroup+foaf%3Aname+%3FnameEn+.%0D%0A%09OPTIONAL+%7B+%3Fgroup+foaf%3Aname+%3FnameCs+.+FILTER+%28lang%28%3FnameCs%29+%3D+%22cs%22%29+%7D%0D%0A%09FILTER+%28lang%28%3FnameEn%29+%3D+%22en%22%29%0D%0A%7D&format=text%2Fhtml&debug=on
>
> It might be a bug in RAP's SPARQL engine.
>
> Best regards
>
> Josef Petrak
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--
Sergey Chernyshev
http://www.sergeychernyshev.com/ |
