# Base: http://example.org/nil.owl
@prefix ns1:     <http://example.org/def/> .
@prefix xs:      <http://www.w3.org/2001/XMLSchema> .
@prefix ns2:     <http://example.org/> .
@prefix rdfs:    <http://www.w3.org/2000/01/rdf-schema#> .
@prefix daml:    <http://www.daml.org/2001/03/daml+oil#> .
@prefix rdf:     <http://www.w3.org/1999/02/22-rdf-syntax-ns#> .
@prefix xs_:     <http://www.w3.org/2001/XMLSchema#> .
@prefix :        <#> .
@prefix owl:     <http://www.w3.org/2002/07/owl#> .

<>    a       owl:Ontology .

ns2:foobar
      a       owl:ObjectProperty , owl:DatatypeProperty , rdf:Property ;
      rdfs:range
              [ a       owl:Class ;
                owl:unionOf (xs_:String [ a       owl:Class ;
                            owl:oneOf (())
                          ])
              ] .