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/
