 <span class="special">;</span>

        <span class="comment">// qi::_val refers to the attribute of the rule on the left hand side </span>
        <span class="identifier">first</span> <span class="special">=</span> <span class="identifier">eps</span>          <span class="special">[</span><span class="identifier">qi</span><span class="special">::</span><span class="identifier">_val</span> <span class="special">=</span> <span class="number">0</span><span class="special">]</span>
            <span class="s