XRD-based Service Discovery - Draft 1

[Martin Atkins]

In respose to the discussion recently about modularizing the discovery 
part of OpenID Authentication 2.0, I've put together a possible first 
draft of a specification for doing service discovery using XRDS.

This document is really just the XRDS-related parts of Yadis but 
refactored slightly.

In particular:
  * XRI Resolution 2.0 is no longer required reading for implementors. 
Instead, it defines its own proper subset of XRDS/XRD which is 
completely defined within this document.
  * The various sentences referring to "authentication services" and 
specifically to OpenID, LID, etc. have been rewritten or removed.

My intention here is that the remaining parts of Yadis that are not 
included in this new specification will become "XRDS Discovery for HTTP 
and HTTPS URLs".

It'd be cool if it could be restructured in such a way that XRI 
Resolution 2.0 becomes only an informative rather than a normative 
reference, but as it currently stands it's used in conjunction with a 
couple of MUST clauses and therefore needs to be normative.

(I was going to put a more readable version of this on the wiki as well, 
but sadly it seems that OpenID login isn't working today... for me, at 
least.)

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