es other than property names and the value(s)
    of the <code>type</code> property.
  </p>

</section>

    <section id="extension-round-trip">

      <h2>Re-serialization of Extensions</h2>

      <p>
        Implementations that use JSON-LD mechanisms to parse and then
        reserialize Activity Streams 2.0 documents that contain extension
        properties SHOULD take sufficient care to ensure that extension
        properties used within the original document are preserved and
        serialized app