# description
The spatial extent of the features in the collection.

# properties.bbox.description
One or more bounding boxes that describe the spatial extent of the dataset.

# properties.bbox.items.description
Each bounding box is provided as four or six numbers, depending on
whether the coordinate reference system includes a vertical axis
(height or depth):

* Lower left corner, coordinate axis 1
* Lower left corner, coordinate axis 2
* Minimum value, coordinate axis 3 (optional)
* Upper right corner, coordinate axis 1
* Upper right corner, coordinate axis 2
* Maximum value, coordinate axis 3 (optional)

The coordinate reference system of the values is WGS 84 longitude/latitude
(http://www.opengis.net/def/crs/OGC/1.3/CRS84) unless a different coordinate
reference system is specified in `crs`.

For WGS 84 longitude/latitude the values are in most cases the sequence of
minimum longitude, minimum latitude, maximum longitude and maximum latitude.
However, in cases where the box spans the antimeridian the first value
(west-most box edge) is larger than the third value (east-most box edge).

If a feature has multiple spatial geometry properties, it is the decision of the
server whether only a single spatial geometry property is used to determine
the extent or all relevant geometries.
The given coordinates should be separated by commas.

# properties.crs.description
Coordinate reference system of the coordinates in the spatial extent
(property `bbox`). The default reference system is WGS 84 longitude/latitude.
In the Core this is the only supported coordinate reference system.
Extensions may support additional coordinate reference systems and add
additional enum values.