e. Naturally, the <code class="computeroutput"><span class="identifier">lex</span><span class="special">::</span><span class="identifier">token_def</span><span class="special">&lt;&gt;</span></code>
            exposes the token value type as its parser attribute, enabling a smooth
            integration with <span class="emphasis"><em>Spirit.Qi</em></span>.
          </p>
<p>
            The next code snippet demonstrates how the required token value types
            are specified while defining the toke