ass="keyword">bool</span> <span class="identifier">parse</span><span class="special">(</span><span class="identifier">Iterator</span><span class="special">&amp;</span> <span class="identifier">first</span><span class="special">,</span> <span class="identifier">Iterator</span> <span class="keyword">const</span><span class="special">&amp;</span> <span class="identifier">last</span>
      <span class="special">,</span> <span class="identifier">Context</span><span class="special">&amp;</span> <span class="ident