GWSW Ontologie
| Naam | Spiraalvormig  |
Helical  |
| URI | BABcd |
| Codering | D |
| Is type | Orientation of the fissure (coll) |
| Orientation lining (coll) | |
| Orientation defective repair (coll) | |
| Orientation lining (manhole) (coll) |