@prefix owl: <http://www.w3.org/2002/07/owl#>.
@prefix : <foo://bla/meta#>.    @prefix p: <foo://bla/persons/>.
:Childless owl:intersectionOf (:Person
  [ a owl:Restriction; owl:onProperty :hasChild; owl:maxCardinality 0]).
:Parent owl:intersectionOf (:Person
  [ a owl:Restriction; owl:onProperty :hasChild; owl:minCardinality 1]).
:name a owl:FunctionalProperty.
p:kate a :Person; :name "Kate"; :hasChild p:john, p:sue.
p:john a :Person; :name "John"; :hasChild p:alice, p:bob.
p:alice a :Person; :name "Alice".
p:bob a :Person; :name "Bob".
p:sue a :Parent; :name "Sue".
p:george a :Person; a :Childless; :name "George".