eference; instead they
        <a href="terminology.html#must-requirement" id="must-requirement_xref49">must</a>
        conform to all syntax constraints defined in the XML
        specification <a href="references.html#refsXML" id="refsXML_xref8">[XML]</a>.</p>
      </dd>
    </dl>
</div>
  <div id="character-references" class="section">
    <h2>4.6. Character references <a class="hash" href="#character-references">#</a> <a class="toc-bak" href="Overview.html#character-references-toc">T</a>
</h2>
    <p>