Hi Lyudmila, as Emil pointed out our sparql support doesn't yet support all possible cases, but according to my knowledge a ?S P ?O construct is supported and tests in the sparql engine verifies that. It can however depend on what other triple constraints your query has. The neo sparql engine needs (as of now, at least) some kind of reasonable starting point; somewhere to start the traversing from and it may be that decision which is causing your problems. If you could send your sparql query I could make a much better conclusion as to the source of the problem.
Best, Mattias 2009/1/30 Emil Eifrem <e...@neotechnology.com>: > On Thu, Jan 29, 2009 at 9:54 PM, Lyudmila Balakireva <lu...@lanl.gov> wrote: >> Hello, >> I was testing sail rdf component and I made test store based >> on VerboseQuadStore . >> I have problem with predicate in sparql . If I specify predicate >> like ?x dc:type ?z the query does not returning anything. (I do >> have dc namespace prefix). It is work if I do (?x?y?z) or (?x ?y >> "snow") or url in subject or object position. >> It is work with specific predicate if I do getStatements(). >> Any clue would be great. > > Hi Luda, > > Our Sparql support is so-so: it's optimized *enough* for the > particular commercial use cases that our Sparql-swinging customers > have required so far. And the ?s predicate ?o pattern may very well be > one that hasn't been required (yet). But Mattias would know more about > this than me. Mattias? > > It's weird though that it works in getStatements(). How have you > configured and assembled your components? Also, do you use > Sparql-over-SAIL or the Neo4j Sparql engine? > > Cheers, > > -- > Emil Eifrém, CEO [e...@neotechnology.com] > Neo Technology, www.neotechnology.com > Cell: +46 733 462 271 | US: 206 403 8808 > _______________________________________________ > Neo mailing list > User@lists.neo4j.org > https://lists.neo4j.org/mailman/listinfo/user > -- Mattias Persson, [matt...@neotechnology.com] Neo Technology, www.neotechnology.com _______________________________________________ Neo mailing list User@lists.neo4j.org https://lists.neo4j.org/mailman/listinfo/user
