x</h2>

    <p>
      Note: While this appendix sections is non-normative, it uses normative
      terms such as MUST. Where used, the meaning is to indicate what would
      be required to properly implement the Activity Streams 1.0 backwards
      compatibility model described in this appendix if an implementer chose
      to do so.
    </p><p>

    </p><p>
      While the syntax defined by this specification diverges from
      that defined by JSON Activity Streams 1.0, the fundamental model
      define