/li>    <li class="argument lambda-list-keyword">&amp;REST</li>    <li class="argument">KNOWN-ATTRIBUTES</li>    <li class="argument lambda-list-keyword">&amp;REST</li>  </ul>  <a class="source-link" href="https://github.com/Shinmera/clip/blob/64eedbbf637a874080bfcd351b69ee6d58588d7f/conditions.lisp#L45">Source</a>  </header> <div class="docstring"><pre>Checks whether there are any unknown attributes present on the node.

If an unknown attribute is present, a warning of type
UNKNOWN-ATTRIBUTE is signalled. 