PHPBBREFExample3 Dump of phpBB Groups and their members PREFIX sioc: <http://rdfs.org/sioc/ns#> SELECT ?grp ?username WHERE { ?group a sioc:Usergroup . optional{ ?group sioc:name ?grp }. optional{ ?group sioc:has_member ?member} . optional{ ?member sioc:name ?username} . } ORDER BY DESC (?grp) Sample Data (Live Query Results) Click *Here* for an Interactive-Web View of phpBB Click *Here* for a live SPARQL Query (via SPARQL Protocol) against a phpBB collection of groups.