In your Web.Release.config or Web.Debug.config, right after ...
<?xml version="1.0" encoding="utf-8"?>
you see ...
<configuration xmlns:xdt="http://schemas.microsoft.com/XML-Document-Transform">
When I browse to this URL, I receive the following content:
The resource you are looking for has been removed, had its name changed, or is temporarily unavailable.
Does that mean there's a new URL and I need to update the xmlns
or can you just not browse it?
That's an XML namespace, not the location of a resource on the web.
It only happens to look like a URL. Some XML namespaces do not look like URLs.