x.html" target="_top">Boost.Fusion</a>
          sequence</em></span> holding <code class="computeroutput"><span class="identifier">A</span></code>,
          <code class="computeroutput"><span class="identifier">B</span></code>, ... etc. elements. Finally,
          <code class="computeroutput"><span class="identifier">Unused</span></code> stands for <code class="computeroutput"><span class="identifier">unused_type</span></code>.
        </p></td></tr>
</table></div>
<h5>
<a name="spirit_x3.quick_reference