ession. In addition the new <code class="computeroutput"><span class="identifier">keyword</span><span class="special">[]</span></code> directive has the advantage to be usable
          for wrapping any parser expression, not only strings as in the example
          above.
        </p>
<h6>
<a name="spirit_repository.qi_components.directives.distinct.h1"></a>
          <span class="phrase"><a name="spirit_repository.qi_components.directives.distinct.header"></a></span><a class="link" href="distinct.html#spi