Discussions posts details returned as an RDF Graph prefix sioc: <http://rdfs.org/sioc/ns#> prefix sioct: <http://rdfs.org/sioc/types#> prefix rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#> prefix dcterms: <http://purl.org/dc/terms/> CONSTRUCT { ?post dcterms:created ?created . ?post sioc:link ?link . ?post sioc:title ?title . } from <http://demo.openlinksw.com/dataspace> where { ?forum a sioct:Discussion . ?post sioc:has_container ?forum . optional{ ?post dcterms:created ?created } . optional{ ?post sioc:link ?link } . optional{ ?post sioc:title ?title } }