PREFIX xsd: PREFIX snvoc: PREFIX sn: PREFIX dbpedia-owl: PREFIX dbpedia: PREFIX foaf: PREFIX rdfs: select ?tagname (count (*) as ?cnt) #Q4 where { ?post a snvoc:Post . ?post snvoc:hasCreator ?fr . ?post snvoc:hasTag ?tag . ?tag foaf:name ?tagname . ?post snvoc:creationDate ?date . sn:pers00000032985348839046 snvoc:knows ?fr . filter (?date >= "2011-02-01T00:00:00.000+00:00"^^xsd:dateTime && ?date <= "2011-02-01T00:00:00.000+00:00"^^xsd:dateTime + xsd:duration("P39D")) . filter (!exists { sn:pers00000032985348839046 snvoc:knows ?fr2 . ?post2 snvoc:hasCreator ?fr2 . ?post2 a snvoc:Post . ?post2 snvoc:hasTag ?tag . ?post2 snvoc:creationDate ?date2 . filter (?date2 < "2011-02-01T00:00:00.000+00:00"^^xsd:dateTime)}) } group by ?tagname order by desc(?cnt) ?tagname limit 10