Re: [Id-event] Thread: Clarifying use of sub and iss in SET tokens

[Benjamin Kaduk <[e-mail]>]

On 03/06/2017 06:39 PM, Mike Jones wrote:
>
> Justin, I suspect you didn’t see my earlier reply to Phil’s note that
> you also replied to, so I’m repeating it here and sending it to you
> directly.  (It wouldn’t be the first time that DMARC policies caused
> some of my contributions to be not received by some participants. :-( )
>
>  
>
> Agreed that this is unclear.  Duplicating information in a protocol
> **always** introduces an unnecessary error case – the need to define
> how to handle the situation in which two pieces of information that
> are required to be identical are different.  Information in a SET
> should occur at most once.
>
>

That seems a dangerous road to tread, as it requires care in defining
"information" -- duplicating the same data strings at different levels
of the hierarchy of a JSON object may very well not be duplicating
information, due to the extra context provided by the hierarchy.  In my
mind, it's not a clear case that you should never send the same
name/value multiple times in different parts of an object, as sometimes
it is good to keep the semantic separation clear.

-Ben