span class="special">,...,</span> <span class="identifier">argN</span><span class="special">)</span>
</pre>
<p>
          After having declared a rule, you can now assign any parser expression
          to it. Example:
        </p>
<pre class="programlisting"><span class="identifier">r</span> <span class="special">=</span> <span class="identifier">double_</span> <span class="special">&gt;&gt;</span> <span class="special">*(</span><span class="char">','</span> <span class="special">&gt;&gt;</span> <span clas