It’s just data

White House Blog Feed

Valid, with warnings.  Notably:

Content-Type: text/xml - technically illegal.  Content contains a “curly” apostrophe properly encoded as utf-8.  Does not tend to cause a problem in practice.

Two entries with the same id - technically legal, but in practice an egregious error.

In related news, is well-formed XHTML 1.0 Transitional, served as... you guessed it... text/html.  This time with charset=utf-8.  Again, nothing that causes any problems in practice.