@prefix ex: <http://my.test/CardinalityTest0#> .
@prefix owl: <http://www.w3.org/2002/07/owl#> .
@prefix rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#> .
@prefix xml: <http://www.w3.org/XML/1998/namespace> .
@prefix xsd: <http://www.w3.org/2001/XMLSchema#> .
@prefix rdfs: <http://www.w3.org/2000/01/rdf-schema#> .

<http://my.test/CardinalityTest0> rdf:type owl:Ontology .

ex:contains rdf:type owl:ObjectProperty.

ex:Item rdf:type owl:Class .

ex:item00 rdf:type ex:Item .

ex:iBox rdf:type [ rdf:type owl:Restriction ;
                   owl:onProperty ex:contains ;
                   owl:qualifiedCardinality "0" ;
                   owl:onClass ex:Item
                 ] ;
        ex:contains ex:item00 .