div class="line">    }</div><div class="line"></div><div class="line">    <span class="comment">// add your custom attributes to the list       </span></div><div class="line">    <span class="keywordtype">bool</span> getAttributeNames (std::list&lt;std::string&gt;&amp; attributeNames)<span class="keyword"> const</span></div><div class="line"><span class="keyword">    </span>{</div><div class="line">        attributeNames.emplace_back (<span class="stringliteral">&quot;my-custom-attribute&quot;</span>);</div