Definitions
Parking layout. Gives more details to the `category` attribute. Allowed values: As per the _ParkingLayoutEnum_ of DATEX II version 2.3. Enum:'automatedParkingGarage, carports, covered, field, garageBoxes, multiLevel, multiStorey, nested, openSpace, rooftop, sheds, singleLevel, surface, other'. See also [OpenStreetMap](http://wiki.openstreetmap.org/wiki/Tag:amenity%3Dparking). Or any other value useful for the application and not covered above.
Generic classification of the layout of the parking