OptionalApplicableOptionalDescriptionOptionalElementOptionalGlobalOptionalOperationIfcDoorType (IFC4+).
OptionalParameterIfcDoorType / IfcWindowType (IFC4+).
OptionalPartitioningIfcWindowType (IFC4+).
OptionalPredefinedEnumeration value without dots. Defaults to NOTDEFINED where the attribute is mandatory.
OptionalTagEXPRESS class of the type object, e.g. 'IfcWallType'. Must be an IfcElementType subtype in the model's schema.
OptionalUserOptionalUser
Explicit GlobalId (22-char IFC GUID); generated when omitted.