Project(Join(Union(BGP( ?t <http://www.w3.org/1999/02/22-rdf-syntax-ns#type> ?c .
                        ?s <http://www.w3.org/1999/02/22-rdf-syntax-ns#type> ?c),
                   BGP( ?t <http://xmlns.com/foaf/0.1/member> ?s)),
             BGP( ?t <http://xmlns.com/foaf/0.1/name> 'Sharks')),
        {?t, ?s})