a> |
          <a href="https://www.w3.org/TR/activitystreams-vocabulary/#dfn-last">last</a> |
          <a href="https://www.w3.org/TR/activitystreams-vocabulary/#dfn-current">current</a>
        </code>
      </p>

      <p>
        The items within a <code><a>Collection</a></code> can be ordered or
        unordered. The <code><dfn>OrderedCollection</dfn></code> type MAY be
        used to identify a Collection whose items are always ordered. In the
        JSON serialization, the unordered items of a Co