# perl -I lib bin/ldf-client.pl  http://fragments.dbpedia.org/2014/en sparql07.txt
PREFIX ontology: <http://dbpedia.org/ontology/>
PREFIX property: <http://dbpedia.org/property/>
PREFIX xsd: <http://www.w3.org/2001/XMLSchema#>
SELECT * { 
  ?craft a ontology:Spacecraft .
  ?craft property:launch ?date .
  FILTER (
    ?date > "1999-01-01"^^xsd:date
  )
}