IfcSpatialZone does not exist before IFC4. Emitting one into an IFC2X3 file would produce an entity no reader of that schema can resolve, so the caller is told rather than handed a file that fails on import.
IfcSpatialZone
IfcSpatialZonedoes not exist before IFC4. Emitting one into an IFC2X3 file would produce an entity no reader of that schema can resolve, so the caller is told rather than handed a file that fails on import.