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author greg
date Tue, 13 Mar 2012 16:29:09 -0400
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PREFIX  xsd: <http://www.w3.org/2001/XMLSchema#>
PREFIX  : <http://example.org/ns#>
SELECT  ?a
WHERE
    { ?a :p ?v . 
      OPTIONAL
        { ?a :q ?w } . 
      FILTER (?w) .
    }