jects.
      Because the 1.0 values are a valid subset allowed by this specification,
      existing implementations are not required to take any specific action to
      continue supporting those values.
    </li>
    <li>
      This specification deprecates the <code>upstreamDuplicates</code> and
      <code>downstreamDuplicates</code> properties defined by Activity Streams
      1.0 and does not provide a replacement. This is due largely to lack of any
      reasonable implementation evidence. While the
