Yahoo available AX attrs - backchannel/endpoint URLs

[SitG Admin]

>One of the things that I'd like to clarify in AX 1.1 is whether or 
>not RPs should be able to deep link directly to the profile pic, or 
>if they're expected to download and cache it themselves. Also, if 
>RPs are able to deep link to the profile pic, then we should also 
>define whether or not the content of the URL be updated when the 
>user updates their pic.

RP's should be able to cache it themselves; if you let me specify an 
avatar URL at any server I control, anyone who views a page with my 
avatar on it will probably be sending me referer metadata that can 
let me track/identify them :(

-Shade