On 3 Nov 2012, at 00:37, Jeffrey Hutzelman wrote:

> 1) accept a list of tokens, instead of just two
> 2) define how things get composed when you combine combined tokens.  For 
> example, say that tokens contain a flat list of identities, and combining 
> results in (@id1, @id2).
> 3) disallow combining of combined tokens
> 4) leave the identity/authz meaning up to the application, including the 
> question of what multiple combination means.
> 
> I prefer option 4.  Well, I prefer options 1 and 4 together, but that would 
> be a change which I don't intend to push for.
> 

I also prefer option 4. This document says nothing about the format of a token, 
which is what really determines what meaning you can attach to the group of 
combined identities. When we come to discuss AFSCombineTokens, we will need to 
address this point - but I'm trying to avoid broadening this discussion to 
incorporate the AFS specific draft at the moment.

Before we all spend a huge amount of time on CombineTokens, I think its worth 
noting that it primarily exists as a building block for AFSCombineTokens. It 
may be more productive to consider what AFSCombineTokens should look like, and 
then which of those features are sufficiently generic that they should be 
back-ported into CombineTokens itself.

Cheers,

Simon.

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