On 5/11/18 4:56 PM, Jason Koh wrote: > Hi, > > I am using Virtuoso opensource v7.2.4. I found that SPARQLs with > transitive relationships return partial results. Could you confirm > this behavior? Here are the reproducing ISQL queries. > > - Data insertion: > > ``` > sparql > prefix : <http://test.abc#> > prefix rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#> > prefix rdfs: <http://www.w3.org/2000/01/rdf-schema#> > prefix owl: <http://www.w3.org/2002/07/owl#> > insert IN GRAPH <urn:test1> > { > :class1 a owl:Class . > :class2 a owl:Class . > :entity0 a :class1. > :entity1 a :class2. > :entity2 a :class2. > :entity0 :relation1 :entity1. > :entity0 :relation1 :entity2. > }; > ``` > > - Verification of the data > > ``` > sparql > select ?s ?p ?o from <urn:test1> where {?s ?p ?o .}; > ``` > > - The problem query > ``` > sparql > prefix : <http://test.abc> > prefix rdfs: <http://www.w3.org/2000/01/rdf-schema#> > select ?s ?o where { > #?o a/rdfs:subClassOf* :class2. # Only returns a tuple. I think > incorrect. > ?o a :class2. # returns all the tuples. I think correct. > ?s :relation1 ?o. > }; > ``` > > If I run the above query, it only returns one pair of ?s and ?o > instead of two pairs of (entity0, entity1) and (entity0, entity1). If > I comment out the transitive line and uncomment the second line, it > returns the correct result with the two pairs. I believe those two > queries should return the same result. > > Is this a bug or do I misunderstand something in the SPARQL? > > Thank you! > > > > With regards, > Jason Koh > cseweb.ucsd.edu/~jbkoh <http://cseweb.ucsd.edu/%7Ejbkoh> >
You have: ``` sparql prefix : <http://test.abc#> prefix rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#> prefix rdfs: <http://www.w3.org/2000/01/rdf-schema#> prefix owl: <http://www.w3.org/2002/07/owl#> insert IN GRAPH <urn:test1> { :class1 a owl:Class . :class2 a owl:Class . :entity0 a :class1. :entity1 a :class2. :entity2 a :class2. :entity0 :relation1 :entity1. :entity0 :relation1 :entity2. }; ``` Where have are your rdfs:subClassOf relations? [1] http://docs.openlinksw.com/virtuoso/rdfsparqlruleexamples/ -- built-in inference docs . -- Regards, Kingsley Idehen Founder & CEO OpenLink Software (Home Page: http://www.openlinksw.com) Weblogs (Blogs): Legacy Blog: http://www.openlinksw.com/blog/~kidehen/ Blogspot Blog: http://kidehen.blogspot.com Medium Blog: https://medium.com/@kidehen Profile Pages: Pinterest: https://www.pinterest.com/kidehen/ Quora: https://www.quora.com/profile/Kingsley-Uyi-Idehen Twitter: https://twitter.com/kidehen Google+: https://plus.google.com/+KingsleyIdehen/about LinkedIn: http://www.linkedin.com/in/kidehen Web Identities (WebID): Personal: http://kingsley.idehen.net/public_home/kidehen/profile.ttl#i : http://id.myopenlink.net/DAV/home/KingsleyUyiIdehen/Public/kingsley.ttl#this
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