  Our AST is exactly the same as what we had before in the <a class="link" href="annotation.html" title="Annotations - Decorating the ASTs">annotations</a>:
      </p>
<pre class="programlisting"><span class="keyword">namespace</span> <span class="identifier">client</span> <span class="special">{</span> <span class="keyword">namespace</span> <span class="identifier">ast</span>
<span class="special">{</span>
    <span class="keyword">struct</span> <span class="identifier">person</span> <span class="special">