OptionalboundariesOptionalDescriptionOptionalGlobalExplicit GlobalId (22-char IFC GUID); generated when omitted.
OptionalgrossGross (centreline) floor area in m² for GrossFloorArea + GrossVolume; defaults to the OuterCurve area when omitted.
OptionalLongOptionalNameOptionalnetNet (inner-face) floor area in m² for Qto_SpaceBaseQuantities; defaults to the OuterCurve polygon's own area when omitted — pass this explicitly whenever OuterCurve is not itself the inner (room-side) face, e.g. a centreline or outer-face boundary, otherwise NetFloorArea can come out larger than GrossFloorArea.
OptionalObjectOptionalPositionOptionalPredefinedSee SpaceRectangleParams.PredefinedType.
Bounding elements → one IfcRelSpaceBoundary each.