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author | atsuko |
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date | Thu, 25 Aug 2011 22:14:55 -0400 |
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PREFIX dc: <http://purl.org/dc/elements/1.1/> PREFIX x: <http://example.org/ns#> SELECT ?title ?price WHERE { ?book dc:title ?title . OPTIONAL { ?book x:price ?price . FILTER (?price < 15) . } . }