Oops, the webpage I mentionned had wrong code.
The correct code to run my query is:
QueryExeuction exec =
QueryExecutionFactory.create(QueryFactory.create("yourfederatedquery",
Syntax.syntaxARQ), new
DatasetImpl(ModelFactory.createDefaultModel()));
exec.execSelect();
Forcing the syntax to Syntax.syntaxARQ is mandatory because
client-side federation is a ARQ-specific feature.
On Tue, Jul 31, 2012 at 9:40 AM, Olivier Rossel
<olivier.ros...@gmail.com> wrote:
> Hi all.
>
> I would like to try Jena basic federation.
>
> I tried this query:
> SELECT DISTINCT ?thCenturyClassicalComposers0 WHERE { SERVICE
> <http://api.talis.com/stores/bbc-backstage/services/sparql> {
> ?thCenturyClassicalComposers0
> <http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
> <http://dbpedia.org/class/yago/20thCenturyClassicalComposers> .
> }} LIMIT 300
>
> with the code provided here:
> cf http://tech.groups.yahoo.com/group/jena-dev/message/48130
>
> I get some results.
>
> Now I try this query:
>
> SELECT DISTINCT ?thCenturyClassicalComposers0 ?comment WHERE { SERVICE
> <http://api.talis.com/stores/bbc-backstage/services/sparql>
> {?thCenturyClassicalComposers0
> <http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
> <http://dbpedia.org/class/yago/20thCenturyClassicalComposers> .
> } SERVICE <http://dbpedia.org/sparql> {?thCenturyClassicalComposers0
> <http://www.w3.org/2000/01/rdf-schema#comment> ?comment} } LIMIT 300
>
> I get no result.
> But when checking data on each endpoint, I should get some results.
>
> Is there something wrong in my SPARQL SERVICE syntax?
>
> BTW, being able to limit/offset/orderBy and OPTIONALize each SERVICE
> block would be uber nice ! ! ! Is it possible already?
