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    If the URL of the XRDS document for a domain were published in DNS, that would fix one of the main qualms I have with EAUT as it exists today. However, I'd like to see someone pin down exactly how this works with existing OpenID models, including support for canonicalization of the OpenID identifier (as is done with redirects in HTTP-based discovery today) and support for delegation. Both of these are just as important/useful for email addresses as they are for HTTP URLs, and I don't want to lose them. Delegation doesn't seem too difficult when using EAUT -- just publish the delegation information at the target URL -- but I'm not sure how normalization would work, especially if you consider the ability to "normalize" an email address into a URL or vice-versa.

    By Martin Atkins at 08:48 pm on 30th Oct 2008