PREFIX xsd: PREFIX snvoc: PREFIX sn: PREFIX dbpedia-owl: PREFIX dbpedia: PREFIX foaf: PREFIX rdfs: select ?fr ?first ?last ?post ?content #Q2 ((?date - xsd:dateTime("1970-01-01T00:00:00.000+00:00")) * 1000 as ?creationDate) where { sn:pers00000000000000005246 snvoc:knows ?fr. optional { ?fr snvoc:firstName ?first } . optional { ?fr snvoc:lastName ?last } . ?post snvoc:hasCreator ?fr. { {?post snvoc:content ?content } union { ?post snvoc:imageFile ?content } union { ?post snvoc:gifFile ?content }} . ?post snvoc:creationDate ?date. filter (?date <= "2012-02-15T00:00:00.000+00:00"^^xsd:dateTime). } order by desc(?creationDate) ?post limit 20