@prefix : <http://example.org/> .
@prefix foaf:       <http://xmlns.com/foaf/0.1/> .

:c foaf:name "Chris" .
:c foaf:mbox "chris@example.org" .
:d foaf:name "Dan" .
:d foaf:mbox "dan@example.org" .
:c foaf:knows :d .