PREFIX rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#> PREFIX atom: <http://atomowl.org/ontologies/atomrdf#> PREFIX sioc: <http://rdfs.org/sioc/ns#> PREFIX sioct: <http://rdfs.org/sioc/types#> SELECT DISTINCT ?title, ?linkr WHERE { ?forum rdf:type sioct:SubscriptionList . ?forum sioc:parent_of ?parentf . ?parentf sioc:container_of ?post . optional { ?post atom:title ?title } . optional { ?post atom:link ?link . ?link atom:LinkHref ?linkr } . }