@prefix dct: . @prefix ns1: . @prefix ns2: . @prefix rdfs: . @prefix skos: . a skos:Concept ; dct:created "2018-03-13" ; dct:modified "2018-04-16" ; ns1:hasProfile , , ; ns2:status ; rdfs:seeAlso ; skos:definition "A 3D reference coordinate system with well-defined origin and orientation of the coordinate axes. A mathematical system."@en ; skos:prefLabel "geographic reference system"@en .