@prefix owl: <http://www.w3.org/2002/07/owl#>.
@prefix rdfs: <http://www.w3.org/2000/01/rdf-schema#>.
@prefix : <foo://bla#>.
  :john :hasChild :bob; :hasSibling :paul, [].
  :hasSibling a owl:SymmetricProperty.
  :paul a [a owl:Restriction; owl:onProperty :hasChild; owl:minCardinality 1].
  :hasChild owl:inverseOf :hasParent.
:propchainFirst a owl:AnnotationProperty.
:propchainSecond a owl:AnnotationProperty.
:hasUncle :propchainFirst :hasParent ; :propchainSecond :hasSibling .