# description
One or more time intervals that describe the temporal extent of the dataset.
The value `null` is supported and indicates an open time intervall.
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.

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