@prefix : <foo://bla/names#>.
@prefix rdfs: <http://www.w3.org/2000/01/rdf-schema#>.
@prefix owl: <http://www.w3.org/2002/07/owl#>.
:Person owl:equivalentClass [a owl:Restriction;
  owl:onProperty :father; owl:someValuesFrom :Person].
:bob :name "Bob";  a :Person; :father :john.
:john :name "John";  a :Person.