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Re: [Rats] Where does a EAT end? (was: Re: WGLC for https://datatracker.ietf.org/doc/html/draft-ietf-rats-eat)

Thomas Fossati <Thomas.Fossati@arm.com> Thu, 02 June 2022 20:30 UTC

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From: Thomas Fossati <Thomas.Fossati@arm.com>
To: Giridhar Mandyam <mandyam@qti.qualcomm.com>, "rats@ietf.org" <rats@ietf.org>
Thread-Topic: [Rats] Where does a EAT end? (was: Re: WGLC for https://datatracker.ietf.org/doc/html/draft-ietf-rats-eat)
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Archived-At: <https://mailarchive.ietf.org/arch/msg/rats/uHQd1u-ds4Voy-wEXEt8-SbHje8>
Subject: Re: [Rats] Where does a EAT end? (was: Re: WGLC for https://datatracker.ietf.org/doc/html/draft-ietf-rats-eat)
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> Giridhar Mandyam <mandyam@qti.qualcomm.com> wrote:
> > > I think the underlying data structures make it extensible,
> > > independent of the CDDL notation.  However if an implementor
> > > chooses to extend EAT without an accompanying standard as a
> > > result, then interoperability may not be assured.  Therefore it is
> > > in an implementor’s interest to define a standard if they are
> > > seeking interop.
>
> > The core difference is the extensibility story for the claims-set is
> > governed by the CWT Claims registry, whilst the EAT type system has
> > no such mechanism (yet).
>
> I don’t agree:  the profile definition addresses interop – see
> https://datatracker.ietf.org/doc/html/draft-ietf-rats-eat#section-7.
> Up to this point, no-one has objected to the way profiles are defined
> in the specification, nor the lack of a registry.

Not sure I follow: profiles are type constraints that apply to
*existing* top-level EAT types.  They can't be used to extend the number
and shape of base EAT types.

FWIW, I'm a big fan of profiles.





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