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

# properties.interval.description
One or more time intervals that describe the temporal extent of the dataset.
The value `null` is supported and indicates an unbounded interval end.
In the Core only a single time interval is supported. Extensions may support
multiple intervals. If multiple intervals are provided, the union of the
intervals describes the temporal extent.

# properties.interval.items.description
Begin and end times of the time interval. The timestamps are in the
temporal coordinate reference system specified in `trs`. By default
this is the Gregorian calendar.

# properties.trs.description
Coordinate reference system of the coordinates in the temporal extent
(property `interval`). The default reference system is the Gregorian calendar.
In the Core this is the only supported temporal coordinate reference system.
Extensions may support additional temporal coordinate reference systems and add
additional enum values.