Problem using non-standard DTD

Dear Colleagues --

I am today, for the first time, trying to validate against 
a non-standard DTD (HTML 4.01 Transitional with the addition
of the attributes MARGINHEIGHT and MARGINWIDTH for the
body element).  Liam Quinn's "A Real Validator" tells
me all is well, but when I try to validate using the
W3C service, I am told that the DTD cannot be fetched
("Object not found").  I can fetch the DTD for myself,
and LYNX -head http://www.rhul.ac.uk/shared/dtds/Augmented.dtd
reports :

	HTTP/1.1 200 OK
	Server: Microsoft-IIS/4.0
	Date: Wed, 06 Sep 2000 12:03:35 GMT
	Content-Type: text/plain
	Accept-Ranges: bytes
	Last-Modified: Wed, 06 Sep 2000 12:01:01 GMT
	ETag: "c0443f20fa17c01:2283"
	Content-Length: 46663

I would be grateful if anyone could help me to identify
the cause of this problem.  The W3C report is appended,
below.

Philip TAYLOR,
Webmaster, RHBNC, University of London
--------
     Document Checked

     URI: http://www.rhul.ac.uk/aut/ 
     Last modified: Wed Sep 6 12:04:53 2000 
     Server: Microsoft-IIS/4.0 
     Content length: 14497 
     Character encoding: iso-8859-1 
     Document type: unknown 

     Below are the results of attempting to parse this document with an SGML parser. 

     Line 1, column 110: 

       ...  "http://www.rhul.ac.uk/shared/dtds/Augmented.dtd">
                                                             ^

     Error: could not get "/shared/dtds/Augmented.dtd" from "www.rhul.ac.uk" (reason given was "Object Not Found")
-- 
Philip TAYLOR
Webmaster, Information Services
Royal Holloway & Bedford New College
Tel:   +44 (0)1784 443172 (Office/answer'phone)
Tel:   +44 (0)7970 443172 (Orange/answer'phone)
Fax:   +44 (0)1784 434348
Mailto:P.Taylor@Rhbnc.Ac.Uk

Received on Wednesday, 6 September 2000 08:19:07 UTC