lue of the <code>type</code>
      property are defined as extensions of <a>Link</a> (see
      <a href="https://www.w3.org/TR/activitystreams-vocabulary/#dfn-mention">Mention</a> for
      instance); otherwise the JSON object is considered an instance
      or extension of <code><a>Object</a></code>.
    </p>

    <section id="object">
      <h2><dfn id="asobject">Object</dfn></h2>

      <p>
        The <code><a href="https://www.w3.org/TR/activitystreams-vocabulary/#dfn-object">Object</a></code>
        