@prefix foaf:       <http://xmlns.com/foaf/0.1/> .
@prefix rdf:        <http://www.w3.org/1999/02/22-rdf-syntax-ns#> .

[ 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 <mailto:alice@work> ] .

[ 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 <mailto:bob@home> ] .