Hi Dóminique,
try checking if skos is a valid prefix, I never had trouble with contructs
in snorql nor directly against the endpoint.
A good way to test if there is another problem not related with prefixes is
to use the complete form, like
?scheme a <http://youuri#Scheme>

Regards
Luis Larrateguy
* May be something http://www.w3.org/2004/02/*skos*/core#Scheme

On Tue, May 15, 2012 at 12:35 PM, Dominique Guardiola <[email protected]
> wrote:

> Hi
> We're trying to query a D2R 0.8 SPARQL endpoint with this kind of SPARQL
> query :
>
> construct {
>    ?scheme ?p ?o .
> } where {
>    ?scheme a skos:Scheme .
>    ?scheme ?p ?o .
> }
>
> But we're getting nothing, whereas the same query works on a similar
> OpenRDF dataset
> is there a limitation with the bundled server (Joseki ?)
>
> thanks
>
> --
> Dominique Guardiola, QUINODE
> • http://www.quinode.fr/
> • Tel : 04.27.86.84.37
> • Mob : 06.15.13.22.27
>
>
>
>
>
>
>
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-- 
Luis Larrateguy
Blog: http://nacho.larrateguy.com.ar/
Web: http://larrateguy.com.ar/luisignacio
------------------------------------------------------------------------------
Live Security Virtual Conference
Exclusive live event will cover all the ways today's security and 
threat landscape has changed and how IT managers can respond. Discussions 
will include endpoint security, mobile security and the latest in malware 
threats. http://www.accelacomm.com/jaw/sfrnl04242012/114/50122263/
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