| Attribute | Type | Defined By |
|---|
| GlobalId | IfcGloballyUniqueId (STRING) | IfcRoot |
| OwnerHistory | IfcOwnerHistory (ENTITY) | IfcRoot |
| Name | IfcLabel (STRING) | IfcRoot |
| Description | IfcText (STRING) | IfcRoot |
| ObjectType | IfcLabel (STRING) | IfcObject |
| ObjectPlacement | IfcObjectPlacement (ENTITY) | IfcProduct |
| Representation | IfcProductRepresentation (ENTITY) | IfcProduct |
| PredefinedType | IfcStructuralSurfaceTypeEnum (ENUM) | IfcStructuralSurfaceMember |
| Thickness | IfcPositiveLengthMeasure (REAL) | IfcStructuralSurfaceMember |
| SubsequentThickness | LIST OF IfcPositiveLengthMeasure (REAL) | IfcStructuralSurfaceMemberVarying |
| VaryingThicknessLocation | IfcShapeAspect (ENTITY) | IfcStructuralSurfaceMemberVarying |