 depth</span>
            <span class="identifier">std</span><span class="special">::</span><span class="identifier">cout</span> <span class="special">&lt;&lt;</span> <span class="char">' '</span><span class="special">;</span>

        <span class="identifier">std</span><span class="special">::</span><span class="identifier">cout</span> <span class="special">&lt;&lt;</span> <span class="string">"tag: "</span> <span class="special">&lt;&lt;</span> <span class="identifier">tag</span><span class="special">;</s