@prefix foaf: .
@prefix rdf: .
[ rdf:subject _:gff ;
rdf:predicate rdf:type ;
rdf:object foaf:Person ] .
[ rdf:subject _:gff ;
rdf:predicate foaf:name ;
rdf:object "Alice" ] .
[ rdf:subject _:gff ;
rdf:predicate foaf:mbox ;
rdf:object ] .
[ rdf:subject _:gff ;
rdf:predicate foaf:knows ;
rdf:object _:g2a ] .
[ rdf:subject _:g2a ;
rdf:predicate rdf:type ;
rdf:object foaf:Person ] .
[ rdf:subject _:g2a ;
rdf:predicate foaf:name ;
rdf:object "Bob" ] .
[ rdf:subject _:g2a ;
rdf:predicate foaf:knows ;
rdf:object _:gff ] .
[ rdf:subject _:g2a ;
rdf:predicate foaf:mbox ;
rdf:object ] .