List of all Posts and their sections: PREFIX rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#> PREFIX sioc: <http://rdfs.org/sioc/ns#> prefix tutorial: <http://demo.openlinksw.com/schemas/tutorial#> prefix foaf: <http://xmlns.com/foaf/0.1/> SELECT * WHERE { ?forum rdf:type tutorial:Post . optional{?forum tutorial:belongs_to_section ?belongs_to_section}. } limit 50 Sample Data (Live Query Results) Click *Here* for an Interactive-Web View of Virtuoso Tutorials. Click *Here* for a live SPARQL Query (via SPARQL Protocol) against a collection of Virtuoso Tutorials.