     The <code class="computeroutput"><span class="identifier">grammar</span><span class="special">&lt;&gt;</span></code>
        and <code class="computeroutput"><span class="identifier">rule</span><span class="special">&lt;&gt;</span></code>
        types are of equal importance to <span class="emphasis"><em>Spirit.Qi</em></span> as they are
        for <a href="../../../../../../libs/spirit/classic/index.html" target="_top"><span class="emphasis"><em>Spirit.Classic</em></span></a>.
        Their main pur