code class="literal">@</code> constructs are read as lists of names,
   which can be separated by either whitespace or commas.  Comments are
   introduced by <code class="literal">#</code>, just as in
   <code class="filename">pg_hba.conf</code>, and nested <code class="literal">@</code> constructs are
   allowed.  Unless the file name following <code class="literal">@</code> is an absolute
   path, it is taken to be relative to the directory containing the
   referencing file.
  </p><p>
   Since the <code 