Re: [netconf] YANG encoding in CBOR

Andy Bierman <andy@yumaworks.com> Thu, 28 March 2019 15:50 UTC

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From: Andy Bierman <andy@yumaworks.com>
Date: Thu, 28 Mar 2019 08:50:34 -0700
Message-ID: <CABCOCHRvoUnWewVSzLJD7pT0LDC8xmqdqqrtNB=SRTEVgQRheA@mail.gmail.com>
To: Michel Veillette <Michel.Veillette@trilliant.com>
Cc: Carsten Bormann <cabo@tzi.org>, Juergen Schoenwaelder <j.schoenwaelder@jacobs-university.de>, "core@ietf.org" <core@ietf.org>, "netconf@ietf.org" <netconf@ietf.org>
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Subject: Re: [netconf] YANG encoding in CBOR
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On Thu, Mar 28, 2019 at 7:06 AM Michel Veillette <
Michel.Veillette@trilliant.com>; wrote:

> +1 for value outside, string inside union
>
>
This is simple, but I was trying to support some very common types (like
ip-address)
that are unions of strings, and are desirable to send as binary instead of
string representation.

Andy

My rational:
>
> - SID can have up to 8 bytes and will provide a marginal compression.
> - Generating SID for all 'enumeration' and 'bits' in case they are used in
> 'union' is lot of overhead to revolve a corner case.
> - YANG also support the 'choice' statement (
> https://tools.ietf.org/html/rfc7950#section-4.2.7) which is similar to
>    the concept of type tagging within union. This construct can be used by
> YANG modules specifically created for
>   embedded applications to take advantage of 'enumeration' encoded as
> value and 'bits' encoded as bit.
>
> Michel
>
>
> -----Original Message-----
> From: Carsten Bormann <cabo@tzi.org>;
> Sent: Thursday, March 28, 2019 9:47 AM
> To: Juergen Schoenwaelder <j.schoenwaelder@jacobs-university.de>;
> Cc: Michel Veillette <Michel.Veillette@trilliant.com>;; Ladislav Lhotka <
> lhotka@nic.cz>;; netconf@ietf.org; core@ietf.org
> Subject: Re: [netconf] YANG encoding in CBOR
>
> So for enum/bits we are back to value outside, string inside union?
> Can we use SIDs instead of the strings for the latter?
> This can’t be much more complicated than assigning a SID to each string
> that occurs in an enum/bits in a union.
>
> Grüße, Carsten
>
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