lass="listitem">
            <a class="link" href="../sequence/concepts/forward_sequence.html" title="Forward Sequence">Forward Sequence</a>
            (If the <a href="http://www.boost.org/libs/mpl" target="_top">MPL</a> sequence
            is a forward sequence.)
          </li>
<li class="listitem">
            <a class="link" href="../sequence/concepts/bidirectional_sequence.html" title="Bidirectional Sequence">Bidirectional
            Sequence</a> (If the <a href="http://www.boost.org/libs/mpl" targ