+1 I think that advertising the extension itself is a good practice.

A RP may prefer OPs that support the extension over ones that don't.

That is the case for PAPE now as an example.

With XRD most of that will be described in the OPs XRD rather than the users, but the same principal should apply.

John B.
On 22-Jul-09, at 12:00 PM, specs-requ...@openid.net wrote:

From: Breno de Medeiros <br...@google.com>
Subject: Re: OPs to advertise support for OpenID extensions via the
        extension's type URI
To: Andrew Arnott <andrewarn...@gmail.com>
Cc: specs@openid.net
Message-ID:
        <29fb00360907221019t10a0393aydbae458ba8c66...@mail.gmail.com>
Content-Type: multipart/alternative;
        boundary=00151750e13a821afc046f4e91df

--00151750e13a821afc046f4e91df
Content-Type: text/plain; charset=ISO-8859-1
Content-Transfer-Encoding: 7bit

I agree with Andrew on this suggestion. I don't think the UI WG proceeded
differently for any particular reason, except that no such convention
existed and we were not aware of side-effects previously. Regardless of interoperability issues with existing libraries, I thinking having a type URI for the extension is desirable from purely semantic standpoint (if a human were to read such document, it would be more logically organized with
'umbrella' type URIs for the extension).

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