Instance of: http://www.w3.org/2004/02/skos/core#Concept
Subject Field unknown
Is Reference of Lot-de#Sense
Perpendicular-en#Sense
Perpendiculaire-fr#Sense
Loodlijn-nl#Sense
Lodlinje-da#Sense
Pystysuora-fi#Sense
Perpendikulær-da#Sense