<entry xmlns="http://www.w3.org/2005/Atom">
  <content>
     <div xmlns="http://www.w3.org/1999/xhtml">
       Plain old image: <img src="http://example.com/foo.png"/>
       Host has a non-standard port: <img src="http://example.com:1234/foo.png"/>
       A non-port colon: <img src="http://u:p@example.com/foo.png"/>
       Several colons: <img src="http://u:p@example.com:1234/foo.png"/>
     </div>
  </content>
</entry>
