PREFIX xsd: PREFIX snvoc: PREFIX sn: PREFIX dbpedia-owl: PREFIX dbpedia: PREFIX foaf: PREFIX rdfs: select ?creator ?p_firstname ?p_lastname where { ?post snvoc:id 2199029860428 . ?post snvoc:hasCreator ?creator . optional { ?creator snvoc:firstName ?p_firstname } . optional { ?creator snvoc:lastName ?p_lastname } . }