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Re: [netmod] 6021 ipv4-prefix

Juergen Schoenwaelder <j.schoenwaelder@jacobs-university.de> Mon, 29 April 2019 16:12 UTC

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Date: Mon, 29 Apr 2019 18:12:24 +0200
From: Juergen Schoenwaelder <j.schoenwaelder@jacobs-university.de>
To: "Rob Wilton (rwilton)" <rwilton@cisco.com>
CC: Ladislav Lhotka <lhotka@nic.cz>, NETMOD WG <netmod@ietf.org>
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Subject: Re: [netmod] 6021 ipv4-prefix
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On Mon, Apr 29, 2019 at 03:58:03PM +0000, Rob Wilton (rwilton) wrote:
> 
> 
> But according to RFC-7950, from a language POV, I think that it is reasonable to interpret the canonical format of ipv4-prefix to match that of its base YANG type, i.e. string.
> 
> 9.4.2.  Canonical Form
> 
>    The canonical form is the same as the lexical representation.  No
>    Unicode normalization of string values is performed.
> 
> Section "9.1.  Canonical Representation" does not state that the canonical format of a type may be overridden by a description statement.
>

Section 9.1 talks about 'types' - the text does not indicate that this
is restricted to built-in types.

We are defining canonical formats of typedefs since RFC 6021, which
was published together with the first version of YANG (RFC 6020). Are
you telling us that we got this all wrong? How do you test for say an
IPv6 address in an xpath expression if you cannot predict how it is
lexically represented?

/js

-- 
Juergen Schoenwaelder           Jacobs University Bremen gGmbH
Phone: +49 421 200 3587         Campus Ring 1 | 28759 Bremen | Germany
Fax:   +49 421 200 3103         <https://www.jacobs-university.de/>

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