Instance of: http://www.w3.org/2004/02/skos/core#Concept
Subject Field unknown
Is Reference of Mandatório-pt#Sense
NT:προαιρετικός-el#Sense
O-el#Sense
Obrigatório-pt#Sense
Privalomas-lt#Sense
Mandatory-en#Sense
Υποχρεωτικός-el#Sense
Pakollinen-fi#Sense
Obligatoire-fr#Sense
Záväzný-sk#Sense
Obvezen-sl#Sense
Obligatorisk-da#Sense
Obbligatorio-it#Sense
Verplicht-nl#Sense
Vorgeschrieben-de#Sense
Kötelezõ-hu#Sense
Obligatorisch-de#Sense
Obligatorio-es#Sense