 fully expanded URI
        label for the <code>foo</code> property is not ideal. To ensure that
        the reserialized object is serialized correctly, implementations that
        perform JSON-LD expansion of received documents SHOULD preserve the
        original <code>@context</code> used when performing the JSON-LD
        expansion, then reuse that when reserializing the object into the
        JSON-LD compacted form.
      </p>

    </section>

  </section>

  <section id="privacy">
    <h2>Privacy 