Help please

I am getting the error:

org.xml.sax.SAXException: Please, fix your system identifier (URI) in the

When I try to validate the stylesheet of the page

That is, when I try to go to the URI:

This puzzles me because I copied the DTD line from the XHTML 1.0
specification., section 3.1.1, point 4.

The first 3 lines of my document source are.

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
<html xmlns="" xml:lang="en" lang="en">

If you can shed any light on this I would be most grateful.

Many Thanks,

Tim Hunt.

Received on Saturday, 30 June 2001 17:54:24 UTC