| OuterContour | ocx:Contour3D_T | [1, ∞] | The geometry of the outer closed contour limiting a surface, represented by a set of trim curves or a closed curve primitive. |
| PlateMaterial | PlateMaterial | [1, 1] | Definition of the Plate material and plate thickness. |
| LimitedBy | LimitedBy | [0, 1] | The references to limiting objects forming a closed contour of the parent element. It is not required that the set of objects is ordered in the correct sequence. |
| Offset | ocx:Quantity_T | [0, 1] | An offset from a reference plane or surface. A positive offset value is in the direction of the surface normal vector. Give an Offset=0 if there is no offset from the referred object. |
| UnboundedGeometry | ocx:UnboundedGeometry_T | [0, 1] | The unbounded surface geometry of the parent element. |
| PlateCutBy | PlateCutBy | [0, 1] | A structural concept defining a cut-out in a surface defined by a parametric hole or a set of generic trim curves. |
| PointOnSurface | ocx:Point3D_T | [0, 1] | For multiple surface solutions, a point on the target surface must be provided. |
| MassProperties | ocx:MassProperties_T | [1, 1] | The mass properties of structure objects (weight and centre of gravity). These properties are provided by the exporting application and can be used as a quality measure by the receiving application to ensure correctness of the import. Both moulded and volume properties can be provided. The volume properties represent the physical mass property of the structure part, while the moulded properties are idealised. |
| ExternalGeometryRef | ocx:ExternalGeometryRef_T | [0, 1] | The ExternalGeometryRef element is used to point to an external geometry representation of the parent entity (e.g. Plate, Stiffener, Bracket, Member). |
| Description | xs:string | [0, 1] | Contains a description of the component its parent represents. The description is stored as a string. You can use this element for whatever purposes you require. This element can be used inside many OCX XML elements but is optional. |
| CustomProperties | ocx:CustomProperties_T | [0, 1] | Container for custom properties. |