PREFIX sioc: <http://rdfs.org/sioc/ns#> PREFIX sioct: <http://rdfs.org/sioc/types#> PREFIX ann: <http://www.w3.org/2000/10/annotation-ns#> SELECT * WHERE { ?forum a sioct:SubscriptionList . ?forum sioc:parent_of ?parentf . ?parentf sioc:container_of ?post . OPTIONAL {?post ann:hasAnnotation ?hn }. OPTIONAL {?hn ann:annotates ?annotates } . OPTIONAL {?hn ann:author ?author } . OPTIONAL {?hn ann:body ?body } . OPTIONAL {?hn ann:created ?created } . OPTIONAL {?hn ann:modified ?modified }. }