OptionalDescriptionOptionalGlobalOptionalNameOptionalObjectClosed outline as a list of 2D storey-local points. Must contain at least 3 points. The polyline is auto-closed: if the last point doesn't equal the first, a closing edge back to the first point is inserted at emit time (matches the IfcPolyline convention).
OptionalPositionLocal placement origin (metres). Defaults to [0, 0, 0].
'polygon' discriminator selects the IfcArbitraryClosedProfileDef path.
OptionalTag
Explicit GlobalId (22-char IFC GUID); generated when omitted.