Re: [Virtuoso-users] SPARQL Conformance

Thomas, I've also tried to write the query in pure SPARQL but failed. I'm afraid that in that case you need SPARQL-BI extensions, not pure SPARQL. Like this: PREFIX rdf: PREFIX foaf: PREFIX dc:

Re: [Virtuoso-users] SPARQL Conformance

Hello Ivan, I am sorry. To make the problem easier to spot I simplified our query somewhat. The original query is as follows: SELECT ?yr ?name ?document WHERE { ?class rdf:type foaf:Document. ?document rdf:type ?class. ?document dcterms:issued ?yr. ?document dc:creator ?author. ?auth

Re: [Virtuoso-users] SPARQL Conformance

Thomas, Yes, this is an intentional parser error. To make the FILTER condition meaningful, it should reside outside OPTIONAL, like this: PREFIX rdf: PREFIX foaf: PREFIX dc: PREFIX dcterm

[Virtuoso-users] SPARQL Conformance

Hi, I have seen in a recent post a question regarding the SPARQL conformance of Virtuoso. There you said, that "Virtuoso SPARQL does not match W3C recommendation 100%". Right now I get a parser error message for a query, which is answered by other SPARQL engines correctly. Is the parser er