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im trying to use one of the filters not exists. has checked this query with sparql validator its syntax is right. im using Twinkle sparql tool.

    # filename: ex067.rq
        PREFIX ab: <http://learningsparql.com/ns/addressbook#>  
          SELECT  ?first ?last
            WHERE
             { ?s ab:firstName ?first .
                 ?s ab:lastName ?last.
                           FILTER NOT EXISTS {?s ab:workTel ?workNum }
                                         }
faiza
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    Twinkle is very old -- 2007? - before SPARQL 1.1 (and before SPARQL 1.0 was even finished). – AndyS Aug 14 '14 at 12:43
  • As @AndyS points out Twinkle won't support this syntax because it didn't exist at the time when Twinkle was written – RobV Aug 14 '14 at 16:46
  • ohhh okay thanks alot. i have windows 7 and i tried to run the same query from command line with this query 'arq --data -/sparql data/ex054.ttl --query -/sparql data/ex067.rq' when i run this it gives a message ONLY ONE QUERY STRING ALLOWED. i have set the envoronment variable correctly. – faiza Aug 15 '14 at 02:05
  • I am new to rdfdotnet and sparql. i want to learn about querying owl files with sparql and all the stuff. can u please kindly provide guidance on where to start?? @RobV thanks – faiza Aug 15 '14 at 08:58

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