E.g.: https://github.com/IFCRail/IFC-Rail-Unit-Test-Reference-Code/blob/c822bf001ea7d4b621936d16b26de0d5d2d1a153/alignment_testset/IFC-WithGeneratedGeometry/GENERATED__HorizontalAlignment_SineCurve_100.0_-1000_-300_1_Meter.ifc#L40 https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcrepresentationresource/lexical/ifcshaperepresentation.htm I presume this is the case for all files.
