span>
<span class="keyword">return</span> <span class="keyword">true</span><span class="special">;</span>
</pre>
<p>
          Take note that we didn't call attr.push_back(val). Instead, we called a
          Spirit provided function:
        </p>
<p>
</p>
<pre class="programlisting"><span class="identifier">traits</span><span class="special">::</span><span class="identifier">push_back</span><span class="special">(</span><span class="identifier">attr</span><span class="special">,</span> <span class="identif