ng)
            </li>
<li class="listitem">
              initialize your rules in your constructor
            </li>
</ol></div>
<p>
          The roman numeral grammar is a very nice and simple example of a grammar:
        </p>
<p>
</p>
<pre class="programlisting"><span class="keyword">template</span> <span class="special">&lt;</span><span class="keyword">typename</span> <span class="identifier">Iterator</span><span class="special">&gt;</span>
<span class="keyword">struct</span> <span class="identifier">