This driver reads files describing Special Use Airspaces in the OpenAir format
Airspace are returned as features of a single layer called 'airspaces', with a geometry of type Polygon and the following fields : CLASS, NAME, FLOOR, CEILING.
Airspace geometries made of arcs will be tesselated. Styling information when present is returned at the feature level.
An extra layer called 'labels' will contain a feature for each label (AT element). There can be multiple AT records for a single airspace segment. The fields are the same as the 'airspaces' layer.