 title="Examples">
        Not all examples in this specification explicitly mark the language of
        natural language properties. This is intentional. The authors and the
        working group wished to avoid having implementers cut-and-paste examples
        from the document with explicit language markup as a template for new
        documents, which would consequently have inaccurate language markup.
      </p>
    </section>
  </section>

  <section id="extensibility">

    <h2>Extensibility</h2>

