@prefix owl: <http://www.w3.org/2002/07/owl#> .
@prefix po: <http://www.essepuntato.it/2008/12/pattern#> .
@prefix rdfs: <http://www.w3.org/2000/01/rdf-schema#> .

po:contains a owl:ObjectProperty ;
    rdfs:label "contains"@en ;
    rdfs:comment "A structured element contains another generic element."@en ;
    rdfs:isDefinedBy <http://purl.org/spar/po/> .