GWSW Ontologie
| Naam | Vertikaal (EN)  |
Vertical (EN)  |
| URI | DABca |
| Codering | A |
| Is type | Orientation of the fissure (manhole) (coll) |
| Orientation lining (manhole) (coll) | |
| Orientation of the weld failure (manhole) (coll) |