[OpenID] HTML markup for discovery in OpenId 2.0

[Jack]

Tony Locke wrote:
> Hi, apologies if this has been raised before, but I couldn't see 
> anything in the archives.
> 
> The OpenId 2.0 specification is intended to be backwards compatible. 
> However in the latest draft (12), the recommended markup for HTML 
> discovery gives the 'rel' attribute in the 'link' element the values 
> 'openid2.provider openid.server' and 'openid2.local_id 
> openid.delegate'. In OpenId 1.x the values for 'rel' were simply 
> 'openid.server' and 'openid.delegate'.
> 
> So to really be compatible with previous versions, the markup should 
> be the same as in OpenId 1.x. Can it be changed back to how it was?
> In my experience with http://www.own-id.com/ if you stick to the 
> specification on this, you break compatibility with previous
> versions.
> 
> Come to think of it, I don't see why a link to the server is needed
> at all. Can someone explain this to me?

These link relations are used to determine what openid user and server
should be the target of the protocol exchange initiated by the Relying
Party. The RP needs to know against which server it should attempt
authentication.

By distinguishing between openid V1 and V2 servers, these relations
allow the RP to request a protocol exchange that the server supports.

You can put in <link rel="..."> tags for both versions, enabling a
V1-only RP to select the V1 fields and rely on the V1 protocol, and a
V2-supporting RP to select a V2 server and a V2 protocol exchange.

HTH,
-- 
Jack.