odrl:refinement leaf node

@prefix odrl: <http://www.w3.org/ns/odrl/2/> .
@prefix owl: <http://www.w3.org/2002/07/owl#> .
@prefix rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#> .
@prefix rdfs: <http://www.w3.org/2000/01/rdf-schema#> .
@prefix skos: <http://www.w3.org/2004/02/skos/core#> .

odrl:refinement a rdf:Property,
        owl:ObjectProperty,
        skos:Concept ;
    rdfs:label "Refinement"@en ;
    rdfs:domain [ a owl:Class ;
            owl:unionOf ( odrl:Action odrl:AssetCollection odrl:PartyCollection ) ] ;
    rdfs:isDefinedBy odrl: ;
    rdfs:range [ a owl:Class ;
            owl:unionOf ( odrl:Constraint odrl:LogicalConstraint ) ] ;
    skos:definition "Constraint used to refine the semantics of an Action, or Party/Asset Collection"@en ;
    skos:note "Example: the Action print is only permitted on 50% of the asset."@en .