   </li>
          </ul>
      </li>
      <li><code>double</code> (number)</li>
      <li><code>duration</code> which can be further sub-typed as a
        <ul>
          <li><code>dayTimeDuration</code> or</li>
          <li><code>yearMonthDuration</code></li>
        </ul>
      </li>
      <li><code>float</code></li>
      <li><code>gDay</code></li>
      <li><code>gMonth</code></li>
      <li><code>gMonthDay</code></li>
      <li><code>gYear</code></li>
      <li><code>gYearMonth</code></li>
      <li>