@prefix  foaf: <http://xmlns.com/foaf/0.1/> .
@prefix  rdf:  <http://www.w3.org/1999/02/22-rdf-syntax-ns#> .
@prefix  bio:  <http://purl.org/vocab/bio/0.1/> .
@prefix  xsd:  <http://www.w3.org/2001/XMLSchema#> .

<> rdf:type foaf:PersonalProfileDocument .

_:a  foaf:mbox  <mailto:celine@work.example.com> ;
     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     <mailto:alice@work.example.com> .