Also, to write a bound
   value that is an empty string, write <code class="literal">""</code>, since writing
   nothing means an infinite bound.
  </p><p>
   Whitespace is allowed before and after the range value, but any whitespace
   between the parentheses or brackets is taken as part of the lower or upper
   bound value.  (Depending on the element type, it might or might not be
   significant.)
  </p><div class="note"><h3 class="title">Note</h3><p>
    These rules are very similar to those for writing 