@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> .