PREFIX rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#> PREFIX sioc: <http://rdfs.org/sioc/ns#> PREFIX sioct: <http://rdfs.org/sioc/types#> PREFIX xsd: <http://www.w3.org/2001/XMLSchema#> PREFIX dct: <http://purl.org/dc/elements/1.1/> PREFIX dcc: <http://purl.org/dc/terms/> SELECT DISTINCT ?forum_name, ?post, ?title, ?cr, ?url, ?links_to WHERE { ?forum a sioct:Briefcase . ?forum sioc:id ?forum_name. ?forum sioc:container_of ?post. optional { ?post dct:title ?title }. optional { ?post dcc:created ?cr }. optional { ?post sioc:link ?url }. optional { ?post sioc:links_to ?links_to }. } ORDER BY DESC (?cr)