Bookmarks Data Space PREFIX sioc: <http://rdfs.org/sioc/ns#> PREFIX sioct: <http://rdfs.org/sioc/types#> PREFIX foaf: <http://xmlns.com/foaf/0.1/> SELECT * WHERE { ?forum a sioct:BookmarkFolder . ?forum sioc:container_of ?post. optional { ?post foaf:maker ?maker }. optional { ?maker foaf:firstName ?fname } . } Sample Data (Live Query Results) View Query Results (via SPARQL Protocol URL) View Query Results (via iSPARQL Results URL) View Query Editor (via iSPARQL Visual Query Editor URL)