<span class="identifier">parser_id</span><span class="special">;</span>
    <span class="keyword">typedef</span> <span class="identifier">Derived</span> <span class="identifier">derived_type</span><span class="special">;</span>
    <span class="keyword">typedef</span> <span class="identifier">qi</span><span class="special">::</span><span class="identifier">domain</span> <span class="identifier">domain</span><span class="special">;</span>

    <span class="comment">// Requirement: p.parse(f, l, context, skip