@prefix skos: . @prefix mmd: . @prefix isothes: . skos:prefLabel "Not available"@en ; skos:definition "This is used when information on the activity type is not available or not provided."@en ; a skos:Concept . mmd:Activity_Type a isothes:ConceptGroup, skos:Collection ; skos:prefLabel "Activity Type"@en ; skos:member .