@prefix foaf: .
@prefix rdf: .
@prefix bio: .
@prefix xsd: .
<> rdf:type foaf:PersonalProfileDocument .
_:a foaf:mbox ;
foaf:name "Celine" ;
bio:event [ a bio:Birth; bio:date "1977-05-02"^^xsd:date ] ;
rdf:type foaf:Person ;
foaf:knows _:b .
_:b foaf:mbox .