lass=identifier>ContextT </span><span class=special>= </span><span class=identifier>parser_context</span><span class=special>&lt;&gt;</span> <span class=special>&gt;
    </span><span class=keyword>class </span><span class=identifier>subrule</span><span class=special>;</span></font></code></pre>
<p>The first template parameter gives the subrule an identification tag. Like 
  the <a href="rule.html">rule</a>, there is a ContextT template parameter that 
  defaults to <code><tt>parser_context</tt></code>. You 