from buildingSMART: This enumeration type
defines if the local object coordinate system or the global world
coordinate system for the project is used to describe the measure
values of entities which have a reference to this type.
NOTE The world coordinate system is given by the IfcGeometricRepresentationContext.WorldCoordinateSystem and is unique within the project. The local (or object) coordinate system is given by IfcProduct.ObjectPlacement and is used by all IfcRepresentation's within the IfcProduct.Representation.
HISTORY: New type in Release IFC2x Edition 2.