Emelia,

> On Sep 16, 2025, at 9:51 PM, emelia <emelia=40brandedcode....@dmarc.ietf.org> 
> wrote:
> 
> Hi Michael, Dick,
> 
> I think perhaps what might be desired here is actually a profile of OAuth 2.1 
> for IPP, that is to say IPP won't be interoperable with all AS's, but it 
> would be interoperable with all AS's that implement or are compatible with 
> the profile for IPP.
> ...

This is basically what we (at the Printer Working Group) have been developing 
with our "IPP OAuth Extensions" specification:

    https://www.pwg.org/ipp

But that is separate from the "original" discussion of relying on versioning 
for interoperability and its pitfalls.

________________________
Michael Sweet

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