Recommended insert inappropriate for XHTML 1.1 pages

To show your readers that you have taken the care to create an interoperable Web page, you may display this icon on any page that validates. Here is the HTML you could use to add this icon to your Web page: 

  <p>
    <a href="http://validator.w3.org/check/referer"><img
        src="http://www.w3.org/Icons/valid-xhtml11"
        alt="Valid XHTML 1.1!" height="31" width="88" /></a>
  </p>

The above excerpt from the XHTML 1.1 response page recommends an insert which does not validate as xhtml1.1Thanks for an invaluable service.Phil McSharry