xsi_key</span></a><span class="special">(</span><span class="special">)</span><span class="special">;</span>
  <span class="keyword">explicit</span> <a class="link" href="xsi_key.html#idp57546592-bb"><span class="identifier">xsi_key</span></a><span class="special">(</span><span class="identifier">key_t</span><span class="special">)</span><span class="special">;</span>
  <a class="link" href="xsi_key.html#idp57548208-bb"><span class="identifier">xsi_key</span></a><span class="special">(</span><span class="ke