<D:propertyupdate xmlns:D="http://www.ietf.org/standards/dav/" xmlns:Z="http://www.w3.com/standards/z39.50/">

  <D:set>

    <D:prop>

      <Z:authors>

        <Z:Author>Jim Whitehead</Z:Author>

        <Z:Author>Roy Fielding</Z:Author>

      </Z:authors>

    </D:prop>

  </D:set>

  <D:remove>

    <D:prop>

      <Z:Copyright-Owner/>

    </D:prop>

  </D:remove>

</D:propertyupdate>