Re: [netmod] comments on draft-ietf-netmod-yang-instance-file-format-04

Andy Bierman <andy@yumaworks.com> Sun, 17 November 2019 23:12 UTC

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From: Andy Bierman <andy@yumaworks.com>
Date: Sun, 17 Nov 2019 15:12:27 -0800
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To: =?UTF-8?Q?Bal=C3=A1zs_Lengyel?= <balazs.lengyel@ericsson.com>
Cc: Martin Bjorklund <mbj@tail-f.com>, NetMod WG <netmod@ietf.org>
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Subject: Re: [netmod] comments on draft-ietf-netmod-yang-instance-file-format-04
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On Sun, Nov 17, 2019 at 10:01 AM Balázs Lengyel <balazs.lengyel@ericsson.com>
wrote:

> See below BALAZS3.
>
>
>
> *From:* Andy Bierman <andy@yumaworks.com>
> *Sent:* 2019. november 18., hétfő 0:58
> *To:* Balázs Lengyel <balazs.lengyel@ericsson.com>
> *Cc:* Martin Bjorklund <mbj@tail-f.com>om>; NetMod WG <netmod@ietf.org>
> *Subject:* Re: [netmod] comments on
> draft-ietf-netmod-yang-instance-file-format-04
>
>
>
> On Sun, Nov 17, 2019 at 6:19 AM Balázs Lengyel <
> balazs.lengyel@ericsson.com> wrote:
>
>  *From:* Andy Bierman <andy@yumaworks.com>
> *Sent:* 2019. november 7., csütörtök 23:58
> *To:* Martin Bjorklund <mbj@tail-f.com>
> *Cc:* Balázs Lengyel <balazs.lengyel@ericsson.com>om>; NetMod WG <
> netmod@ietf.org>
> *Subject:* Re: [netmod] comments on
> draft-ietf-netmod-yang-instance-file-format-04
>
>
>
> It seems strange that the details that don't matter at all (like the
> filename) have lots
>
> of rules that MUST be followed and the details that actually add standards
> value are left unspecified.
>
> Andy
>
> BALAZS2: Actually what is missing, unspecified?
>
>
>
> The inline-schema is under-specified.
>
> There is no way for the file reader to know what to expect as the child
> nodes of inline-schema.
>
>
>
> The file writer can put anything there and a 3rd party reader tool is
> expected to support it.
>
>
>
>            anydata inline-schema {
>
>              mandatory true;
>
>              description
>
>                "Instance data corresponding to the YANG modules
>
>                 specified in the inline-module nodes defining the set
>
>                 of content defining YANG modules for this
>
>                 instance-data-set.";
>
>            }
>
>
>
>
>
> Andy
>
>
>
> BALAZS3:
>
> IMO the anydata is specified.  The leaf-list inline-module defines the
> modules that define how anydata inline-schema should look like.
>
>            anydata inline-schema {
>
>              mandatory true;
>
>              description
>
>                "*Instance data corresponding to the YANG modules*
>
> *                specified in the inline-module* ...
>
>
>
> The fileReader/fileWriter shall look at the ‘*leaf-list inline-module*’
> and from that it knows what to read/write.
>
>
>
> I wanted to state that inline-schema anydata always follows the
> ietf-yang-library and maybe some YAMs augmenting it. However Juergen
> insisted in a more flexible solution.
>


I think the following text (or similar) should be added to the
description-stmt above

    This node SHOULD contain a single container instance which represents
either the /yang-library
     or /modules-state subtree.

This allows for exceptions but still provides interoperability instructions.


Andy





>
>