        <span class="keyword">template</span><span class="special">&lt;&gt;</span> <span class="keyword">struct</span> <span class="identifier">tag</span><span class="special">&lt;</span><span class="identifier">QPolygon</span><span class="special">&gt;</span> <span class="special">{</span> <span class="keyword">typedef</span> <span class="identifier">polygon_tag</span> <span class="identifier">type</span><span class="special">;</span> <span class="special">};</span>
            <span class="keyword">templa