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From: Alvaro Retana <aretana.ietf@gmail.com>
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To: "Les Ginsberg (ginsberg)" <ginsberg@cisco.com>, 
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Subject: Re: [Lsr] When is an IANA Registry Required
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On March 17, 2021 at 12:25:25 PM, Les Ginsberg wrote:

> > In the extreme case anyone can make use of the bits, through the ISE
> > or a different SDO -- ideally we will be paying attention, but may
> > not. Sure, a registry doesn't stop implementations from squatting on
> > codepoints either (even inside the IETF), but at least people have to
> > want to bypass the allocation rules.
> >
>
> [Les:] When a specification says "all other bits are reserved, MUST be se=
nt
> as 0 and MUST be ignored on receipt", I do not see how anyone can assume =
they
> can use them - nor why the existence of a registry would prevent such a
> squatter from doing whatever they want outside of normal channels.
>
> Are you suggesting that normative statements in RFCs simply don=E2=80=99t=
 mean
> anything?

Not at all!

The "MUST send as 0 and MUST ignore" text is normally used when the
application of those bits has not been defined. =C2=A0If you define the use
of one of the bits then you will obviously set/not ignore it, whether
it has been defined in an ID/RFC or not. =C2=A0As I said, "a registry
doesn't stop implementations from squatting on codepoints either (even
inside the IETF), but at least people have to want to bypass the
allocation rules."

I don't know that you and I are getting anywhere. =C2=A0I know Robert also
cares about this topic, I hope others do too.

Alvaro.

