| Name | Type | Cardinality | Description |
| FreeEdgeCurve3D | FreeEdgeCurve3D | [1, ∞] | A single Curve3D or a collection of continuous non-closed Curve3D types which are used to represent a free edge of a panel or plate in shipbuilding. |
| EdgeCurveRef | EdgeCurveRef | [1, ∞] | A reference to a Panel, Plate or bracket boundary curve. Used as landing curve for a faceplate or edge reinforcement stiffener. |
| EdgeReinforcementRef | ocx:EdgeReinforcementRef_T | [1, ∞] | A reference to a structure EdgeReinforecement instance. |
| GridRef | GridRef | [1, ∞] | An element that makes a reference to a grid definition. An offset along the grid reference normal vector can be given. |
| PanelRef | PanelRef | [1, ∞] | The reference to a connected Plate. |
| SeamRef | SeamRef | [1, ∞] | The reference to a connected Plate. |
| StiffenerRef | StiffenerRef | [1, ∞] | A reference to a Stiffener. |
| SurfaceRef | SurfaceRef | [1, ∞] | The reference to a Surface geometry which is shared between more than one part. |