pular extensions are included in the Activity Streams 2.0 namespace
        document, and can be reviewed at <a href="https://www.w3.org/ns/activitystreams#extensions">https://www.w3.org/ns/activitystreams#extensions</a>.
        The <a href="https://www.w3.org/community/swicg/">Social Web Incubator Community Group</a> maintains a
        wiki page on <a href="https://www.w3.org/wiki/Activity_Streams_extensions">Activity Streams extensions</a>.
      </p>

      <p>
        It is important to note that the 