Circular tube. Tube has the following child elements:
| Child | Namespace | Type | Use | Cardinality | Choice | Description |
|---|---|---|---|---|---|---|
| Diameter | ocx | ocx:Quantity_T | req. | [1, 1] | False | The tube diameter. |
| Thickness | ocx | ocx:Quantity_T | req. | [1, 1] | False | The thickness of the parent element. |