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http://def.isotc211.org/iso19107/2003/CoordinateGeometry#
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GM_Placement
http://def.isotc211.org/iso19107/2003/CoordinateGeometry#GM_Placement
skos:definition
http://www.w3.org/2004/02/skos/core#definition
A placement takes a standard g ...... y) in 2D, or (x, y, z) in 3D.
graph:default
https://triplydb.com/iso/19107/graphs/default