pose is still the same: they allow to define non-terminals
        and they are the main building blocks for more complex parsers. Nevertheless,
        both types have been redesigned and their interfaces have changed. Let's
        have a look at two examples first, we'll explain the differences afterwards.
        Here is a simple grammar and its usage in <a href="../../../../../../libs/spirit/classic/index.html" target="_top"><span class="emphasis"><em>Spirit.Classic</em></span></a>:
      </p>
<p>
</p>