Error Message Question

I ran the validator on a file with the following beginning:

<?xml version="1.0" encoding="utf-8" ?>
<!DOCTYPE html PUBLIC "=//w3c//DTD XHTML 1.1//EN"
"http://www.w3.org/TR/xhtml11/DTD/xhtml11.dtd">
<html xmlns = "http://www.w3.org/1999/xhtml">
....

and get:

Failed validation, 0 error

Unknown parse mode
....
Namespace Found in non-XML document
....

I have tried the upload-file version of the validator with both IE and FireFox browsers, but both produce the above output. The document validated last year! What's my problem?

Received on Monday, 16 January 2006 19:30:58 UTC