@prefix foaf: <http://xmlns.com/foaf/0.1/> .
@prefix owl: <http://www.w3.org/2002/07/owl#> .
@prefix pro: <http://purl.org/spar/pro/> .
@prefix rdfs: <http://www.w3.org/2000/01/rdf-schema#> .

pro:isHeldBy a owl:ObjectProperty ;
    rdfs:label "is role held by"@en ;
    rdfs:comment "The agent holding a role in time."@en ;
    rdfs:domain pro:RoleInTime ;
    rdfs:isDefinedBy pro: ;
    rdfs:range foaf:Agent .