PREFIX sioc: <http://rdfs.org/sioc/ns#> PREFIX sioct: <http://rdfs.org/sioc/types#> PREFIX dct: <http://purl.org/dc/elements/1.1/> PREFIX dcc: <http://purl.org/dc/terms/> SELECT ?creator ?description ?date ?subject ?title ?created ?modified ?content ?topic WHERE { ?forum a sioct:BookmarkFolder . ?forum sioc:container_of ?post . OPTIONAL{ ?post dct:creator ?creator}. OPTIONAL{ ?post dct:description ?description}. OPTIONAL{ ?post dct:date ?date}. OPTIONAL{ ?post dct:subject ?subject}. OPTIONAL{ ?post dct:title ?title }. OPTIONAL{ ?post dcc:created ?created}. OPTIONAL{ ?post dcc:modified ?modified}. OPTIONAL{ ?post sioc:content ?content} . OPTIONAL{ ?post sioc:topic ?topic} . }