Hi Joshua BINDINGS is being changed to be VALUES instead by the SPARQL working group which works similarly except that it can be applied more broadly i.e. Used throughout queries rather than only at the end
The version of ARQ you are using (2.8.7) is very old and pre-Apache which makes it at least a year old so may explain why BINDINGS was accepted by the parser but not implemented. The latest version 2.9.2 just came out and supports the new VALUES syntax Rob On 7/2/12 12:11 PM, "Joshua TAYLOR" <joshuaaa...@gmail.com> wrote: >Hello, I just noticed that while ARQ doesn't complain about the >presence of BINDINGS in a query, it doesn't seem to do anything with >it either. I tried recreating the example given in the working draft >[http://www.w3.org/TR/sparql11-query/#bindings] and so end up with the >following data and query: > >== Data == >@prefix dc: <http://purl.org/dc/elements/1.1/> . >@prefix : <http://example.org/book/> . >@prefix ns: <http://example.org/ns#> . > >:book1 dc:title "SPARQL Tutorial" . >:book1 ns:price 42 . >:book2 dc:title "The Semantic Web" . >:book2 ns:price 23 . > >== Query == >PREFIX dc: <http://purl.org/dc/elements/1.1/> >PREFIX : <http://example.org/book/> >PREFIX ns: <http://example.org/ns#> > >SELECT ?book ?title ?price >{ > ?book dc:title ?title ; > ns:price ?price . >} >BINDINGS ?book { > (:book1) >} > >and though the prescribed result is the single row: > ><http://example.org/book/book1> "SPARQL Tutorial" 42 > >I get two rows when I run this through Jena/ARQ: > >$ arq --version >Jena: VERSION: 2.6.4 >Jena: BUILD_DATE: 2010-12-12T16:56:15+0000 >ARQ: VERSION: 2.8.7 >ARQ: BUILD_DATE: 2010-12-12T14:07:48+0000 >$ arq --debug -v --query book_query.sparql --data book_data.n3 > 1 PREFIX dc: <http://purl.org/dc/elements/1.1/> > 2 PREFIX : <http://example.org/book/> > 3 PREFIX ns: <http://example.org/ns#> > 4 > 5 SELECT ?book ?title ?price > 6 WHERE > 7 { ?book dc:title ?title . > 8 ?book ns:price ?price > 9 } > 10 BINDINGS ?book > 11 { > 12 ( :book1 ) > 13 } > > INFO [main] (Explain.java:228) - QUERY > PREFIX dc: <http://purl.org/dc/elements/1.1/> > PREFIX : <http://example.org/book/> > PREFIX ns: <http://example.org/ns#> > > SELECT ?book ?title ?price > WHERE > { ?book dc:title ?title . > ?book ns:price ?price > } > BINDINGS ?book > { > ( :book1 ) > } > INFO [main] (Explain.java:228) - ALGEBRA > (project (?book ?title ?price) > (bgp > (triple ?book <http://purl.org/dc/elements/1.1/title> ?title) > (triple ?book <http://example.org/ns#price> ?price) > )) > INFO [main] (Explain.java:228) - BGP :: (?book ><http://purl.org/dc/elements/1.1/title> ?title) (?book ><http://example.org/ns#price> ?price) > INFO [main] (Explain.java:228) - Reorder :: (?book ><http://purl.org/dc/elements/1.1/title> ?title) (?book ><http://example.org/ns#price> ?price) >--------------------------------------- >| book | title | price | >======================================= >| :book2 | "The Semantic Web" | 23 | >| :book1 | "SPARQL Tutorial" | 42 | >--------------------------------------- > >Is this the expected behavior? BINDINGS doesn't seem to be rejected, >but silently ignored. I know that initial bindings can be set >programmatically through the API, so I figured that BINDINGS would >work too, but it doesn't seem to. > >Thanks in advance, >//JT > >-- >Joshua Taylor, http://www.cs.rpi.edu/~tayloj/
