@prefix : <foo://bla/names#>.
@prefix rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#>.
@prefix owl: <http://www.w3.org/2002/07/owl#>.
 [ :name "John";  :age 35;
   :child [:name "Alice"; :age 10], [:name "Bob"; :age 8], [:age 12 ];
   rdf:type :oneChildParent].
:oneChildParent owl:equivalentClass [rdf:type owl:Restriction;
  owl:onProperty :child; owl:cardinality 1].