/span><span class="special">&lt;</span>
                <span class="keyword">typename</span> <span class="identifier">traits</span><span class="special">::</span>
                    <span class="identifier">attribute_of</span><span class="special">&lt;</span><span class="identifier">Subject</span><span class="special">,</span> <span class="identifier">Context</span><span class="special">,</span> <span class="identifier">Iterator</span><span class="special">&gt;::</span><span class="identifier">type</span>