Thank You so much gentlemen! I will make the suggested modifications and hopefully I will make that work.
Have a great day! Best Regards Hyrundo > On Nov 28, 2019, at 11:33 AM, Andy Seaborne <[email protected]> wrote: > > Hi Hyrundo, > > The query as written is executed locally, and when execution reaches the > SERVICE clauses the engine calls out to the named service. > > Instead of: > QueryExecutionFactory.sparqlService > use > QueryExecutionFactory.create > > Andy > > On 27/11/2019 16:23, Hyrundo Publishing Association wrote: >> Hello Sirs at Jena, >> I am following the examples of federated queries given at this URL: >> https://www.oclc.org/developer/news/2016/federated-queries-with-sparql.en.html >> >> <https://www.oclc.org/developer/news/2016/federated-queries-with-sparql.en.html><https://www.oclc.org/developer/news/2016/federated-queries-with-sparql.en.html >> >> <https://www.oclc.org/developer/news/2016/federated-queries-with-sparql.en.html>> >> and then I’m trying to replicate the results bringing those SPARQL examples >> into a Jena/Java Main class in NetBeans… >> with no results… >> For example, the given SPARQL code: >> PREFIX schema: <http://schema.org/> >> PREFIX library: <http://purl.org/library/> >> PREFIX wdt: <http://www.wikidata.org/prop/direct/> >> PREFIX dct: <http://purl.org/dc/terms/> >> SELECT ?work ?workLabel >> FROM <http://www.worldcat.org/oclc/470488115> >> WHERE { >> <http://www.worldcat.org/oclc/470488115> schema:author ?creatorURI. >> BIND(replace(STR(?creatorURI), "^(.*[\\/])*", "") AS ?creatorID) >> {SERVICE <https://query.wikidata.org/sparql> { //endpoint n.1 >> ?author wdt:P214 ?creatorID. >> ?work wdt:P50 ?author . >> ? work wdt:P1476 ?workLabel >> } >> } >> UNION >> { >> SERVICE <http://bnb.data.bl.uk/sparql> { //endpoint n.2 >> ?bl_creator ?creatorURI. >> ?work dct:creator ?bl_creator. >> ?work dct:title ?workLabel >> } >> } >> } >> When having two different endpoints to query, how to set the query execution >> in Jena? >> Query query = QueryFactory.create(queryStr); >> QueryExecution qexec = >> QueryExecutionFactory.sparqlService(“http://URL_of_the_SPARQL_endpoint >> <http://url_of_the_sparql_endpoint/>", query) ? >> Any hint? >> Thank you in advance. >> Hyrundo
