Hi Igor-- If you mean enabling (um) Grandma Goldie to delegate child pickup 
duties to Tom the Taxi Driver after having been herself delegated to pick up 
the child by Peter Parent, then -- as long as we're focusing on policy-based 
claims-tested authorization for requesting party access, then UMA would likely 
treat both cases of delegation as the normal course of business since the UMA 
host (RS) doesn't care how the current authorizing user (RO) "won" its own 
access in the first place.

If we're only talking about the realm of client app (UMA requester) identities 
and not an actual legally liable third party, there are a number of OAuth 
profiling tricks that can be, and seem to have been, proposed...

For folks interested in the use cases with the legally liable parties, you can 
find a passel of them here:

http://docs.kantarainitiative.org/uma/draft-uma-trust.html (particularly the 
Use Cases section: 
http://docs.kantarainitiative.org/uma/draft-uma-trust.html#anchor1)
http://kantarainitiative.org/confluence/download/attachments/62324760/UMA_Personal_Loan_v01.pdf
 - explores RO-to-organization sharing in detail

These are, of course, in addition to the original (now pretty old) use cases 
doc I've mentioned on this list before:

http://kantarainitiative.org/confluence/display/uma/UMA+Scenarios+and+Use+Cases

        Eve

On 18 Oct 2012, at 9:53 AM, Igor Faynberg <igor.faynb...@alcatel-lucent.com> 
wrote:

> Looks like a good description of a new use case to me!
> 
> Igor
> 
> On 10/17/2012 10:23 PM, zhou.suj...@zte.com.cn wrote:
>> 
>> 
>> Hi, Thomas, 
>> 
>>    Sorry for reply late. I somehow missed the emails from OAUTH list. 
>> 
>> "What may not be clear up-front from reading the UMA core spec is that
>> there are 5 parties involved (AM, Alice/RO, Host, Bob (Requesting
>> Party) and Bob's portal/platform (Requester)).
>> 
>> Here's a more accurate picture:
>> 
>> - I deposit my Child at the Kindergarten.
>> - I delegate my old Grandmother to pick up the Child.
>> - My Grandmother takes a taxi.
>> - The taxi Driver acts as proxy to my old Grandmother who stays in the
>> taxi.
>> - The taxi Driver needs to show 2 forms of Delegation to the Teacher.
>> - The Taxi driver walks the Child to the taxi.
>> 
>> Bear in mind that my Grandmother now has to manage the delegation she
>> gave the taxi Driver (plus the Scopes involved)." 
>> 
>> 
>> If I understand correctly, old Grandma means Bob the requesting Party, 
>> the taxi driver means Bob the requester in UMA? 
>> Not talking  about UMA, Bob is not separate between roles in OAUTH, 
>> so don't have to redelegate in OAUTH?
>> 
>> 
>> 
>> 
>> 
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Eve Maler                                  http://www.xmlgrrl.com/blog
+1 425 345 6756                         http://www.twitter.com/xmlgrrl


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