amp</code> might be used to represent the ranges of
  time that a meeting room is reserved. In this case the data type
  is <code class="type">tsrange</code> (short for <span class="quote">“<span class="quote">timestamp range</span>”</span>),
  and <code class="type">timestamp</code> is the subtype.  The subtype must have
  a total order so that it is well-defined whether element values are
  within, before, or after a range of values.
 </p><p>
  Range types are useful because they represent many elemen