Uniqueness of Attributes (2)

Legal Example :

   <?xml version="1.0"?>
   <RESERVATION xmlns="http://www.aeroline.com/reservations"
                xmlns:html="http://www.w3.org/1999/xhtml">
      <NAME html:class="largeSansSerif">Layman, A</NAME>
      <SEAT class="Y" html:class="largeMonotype">33B</SEAT>
      <html:a href='/cgi-bin/ResStatus'>Check Status</html:a>
      <DEPARTURE>1997-05-24T07:55:00+1</DEPARTURE>
   </RESERVATION>