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Clarify Transportation geometry types #208

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2 changes: 2 additions & 0 deletions specs/specs.bs
Original file line number Diff line number Diff line change
Expand Up @@ -626,6 +626,8 @@ Four City Objects are related to transportation:
- `"Waterway"`
- `"TransportSquare"` (to model for instance parking lots and squares)

The geometry of a City Object of the transportation types (`"Road"`, `"Railway"`, `"Waterway"`, `"TransportSquare"`) can only be represented with these Geometry Objects: (1) `"MultiLineString"`, (2) `"MultiSurface"`, (3) `"CompositeSurface"`.

Observe that the "Section", "Intersection", and "Track" classes from CityGML are omitted because they can be easily specified using specific attributes.

```json
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