t values in a
  single range value, and because concepts such as overlapping ranges can
  be expressed clearly. The use of time and date ranges for scheduling
  purposes is the clearest example; but price ranges, measurement
  ranges from an instrument, and so forth can also be useful.
 </p><p>
  Every range type has a corresponding multirange type. A multirange is
  an ordered list of non-contiguous, non-empty, non-null ranges. Most
  range operators also work on multiranges, and they have a few functions
