@prefix foaf: .
@prefix rdf: .
@prefix bio: .
@prefix xsd: .
<> rdf:type foaf:PersonalProfileDocument .
_:d a foaf:Person ;
foaf:mbox ;
foaf:name "Daniel" ;
foaf:nick "Dan" ;
foaf:nick "Danny" ;
rdf:type foaf:Person ;
bio:event [ a bio:Birth; bio:date "1976-04-15"^^xsd:date ] .
_:d foaf:knows _:c .
_:c foaf:mbox .
rdf:type foaf:PersonalProfileDocument .
_:d foaf:knows _:f .
_:f a foaf:Person ;
foaf:name "Fred" ;
foaf:mbox ;
bio:event [ a bio:Birth; bio:date "1978-06-30"^^xsd:date ] .