">;</span>
  <span class="identifier">attribute_value_set</span><span class="special">::</span><span class="identifier">mapped_type</span> 
  <a class="link" href="record.html#idm23100-bb"><span class="keyword">operator</span><span class="special">[</span><span class="special">]</span></a><span class="special">(</span><span class="identifier">attribute_value_set</span><span class="special">::</span><span class="identifier">key_type</span><span class="special">)</span> <span class="keyword">const</span><span