ass="special">&amp;</span> <span class="identifier">tag</span><span class="special">,</span> <span class="identifier">string</span> <span class="keyword">const</span><span class="special">&amp;</span> <span class="identifier">value</span><span class="special">,</span> <span class="keyword">int</span> <span class="identifier">depth</span><span class="special">)</span> <span class="keyword">const</span>
    <span class="special">{</span>
        <span class="keyword">for</span> <span class="special">(</span><