Re: [Cbor] Roman Danyliw's No Objection on draft-ietf-cbor-cddl-control-06: (with COMMENT)

Roman Danyliw <rdd@cert.org> Wed, 20 October 2021 15:35 UTC

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From: Roman Danyliw <rdd@cert.org>
To: Carsten Bormann <cabo@tzi.org>
CC: The IESG <iesg@ietf.org>, "draft-ietf-cbor-cddl-control@ietf.org" <draft-ietf-cbor-cddl-control@ietf.org>, "cbor-chairs@ietf.org" <cbor-chairs@ietf.org>, "cbor@ietf.org" <cbor@ietf.org>, =?utf-8?B?Q2hyaXN0aWFuIEFtc8O8c3M=?= <christian@amsuess.com>
Thread-Topic: Roman Danyliw's No Objection on draft-ietf-cbor-cddl-control-06: (with COMMENT)
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Date: Wed, 20 Oct 2021 15:35:04 +0000
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Subject: Re: [Cbor] Roman Danyliw's No Objection on draft-ietf-cbor-cddl-control-06: (with COMMENT)
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Hi Carsten!

> -----Original Message-----
> From: Carsten Bormann <cabo@tzi.org>
> Sent: Wednesday, October 20, 2021 11:06 AM
> To: Roman Danyliw <rdd@cert.org>
> Cc: The IESG <iesg@ietf.org>; draft-ietf-cbor-cddl-control@ietf.org; cbor-
> chairs@ietf.org; cbor@ietf.org; Christian Amsüss <christian@amsuess.com>
> Subject: Re: Roman Danyliw's No Objection on draft-ietf-cbor-cddl-control-06:
> (with COMMENT)
> 
> Hi Roman,
> 
> On 2021-10-20, at 16:05, Roman Danyliw via Datatracker <noreply@ietf.org>
> wrote:
> >
> > ----------------------------------------------------------------------
> > COMMENT:
> > ----------------------------------------------------------------------
> >
> > ** Section 2.2.  Checking my understanding of string concatenation:
> >
> > (a) “Target and controller MUST be strings”
> >
> > (b) “If the target is a text string, the result of that concatenation
> > MUST be valid UTF-8”.
> >
> > There is a distinction being made between a “text string” and “byte
> > string” per Section 3.1 of RFC8610?
> 
> In the context of CDDL we do distinguish between text strings and byte strings
> (inherited from CBOR, which pretty much started to exist when we couldn’t get
> that distinction cleanly introduced into msgpack in 2012).
> 
> Maybe we can honor POLA (*) by not using “strings” to refer to the type union
> of either, while keeping the reader unsuspecting.
> 
> Now https://github.com/cbor-wg/cddl-control/pull/12

Thanks for explaining.  The edits in the pull request makes is clear.  

Much appreciated,
Roman

> 
> Grüße, Carsten
> 
> (*) https://en.wikipedia.org/wiki/Principle_of_least_astonishment
> (not https://en.wikipedia.org/wiki/Principle_of_least_privilege :-)