Hi Timo,
What is the version of the Virtuoso Sesame Provider you are using, run the
command:
java -jar virt_sesame2.jar
If you are running a Virtuoso open source build from before the last July 2010
6.12 release you may not have variable binding support. Please download the
latest provider from the following location and try again:
http://virtuoso.openlinksw.com/dataspace/dav/wiki/Main/VOSDownload#Sesame
From your example:
>>> TupleQuery query = conn.prepareTupleQuery(QueryLanguage.SPARQL,
>>> "select ?s ?p ?o where { ?s ?p ?o } limit 5");
>>> query.setBinding("p", RDFS.LABEL);
The Virtuoso sesame provider should convert the query to:
select ?s <http://www.w3.org/2000/01/rdf-schema#label> ?o where { ?s
<http://www.w3.org/2000/01/rdf-schema#label> ?o } limit 5
Best Regards
Hugh Williams
Professional Services
OpenLink Software
Web: http://www.openlinksw.com
Support: http://support.openlinksw.com
Forums: http://boards.openlinksw.com/support
Twitter: http://twitter.com/OpenLink
On 3 Dec 2010, at 10:14, Timo Westkämper wrote:
> Hi.
>
> It appears that the Virtuoso Sesame adapter doesn't use the variable
> bindings supplied to queries.
>
> Here is an example :
>
> TupleQuery query = conn.prepareTupleQuery(QueryLanguage.SPARQL,
> "select ?s ?p ?o where { ?s ?p ?o } limit 5");
> query.setBinding("p", RDFS.LABEL);
>
> The effective SPARQL query should be something like "select ?s ?p ?o
> where { ?s ?p ?o. FILTER (?p == rdfs:label ) . } limit 5", but Virtuoso
> uses the raw query without the bindings.
>
> Any chance to get a fix for this?
>
> Br,
> Timo Westkämper
>
>
>
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