      <code>upstreamDuplicates</code> and <code>downstreamDuplicates</code>
      properties MAY continue to be used, implementations SHOULD avoid them.
    </li>
    <li>
      In Activity Streams 1.0, the "<code>post</code>" verb was defined to
      describe the action of both creating an object and "posting" or uploading
      it to a service. This specification replaces the "<code>post</code>" verb
      with separate
      <code><a href="https://www.w3.org/TR/activitystreams-vocabulary/#dfn-create">Cr