Instance of: http://www.w3.org/2004/02/skos/core#Concept
Subject Field unknown
Is Reference of Compulsory postage-en#Sense
Verplichte frankering-nl#Sense
Compulsory prepayment-en#Sense
Freimachungszwang-de#Sense
Affranchissement obligatoire-fr#Sense
Franqueo obligatorio-es#Sense
Frankierungszwang-de#Sense