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Re: [netmod] Query about augmenting module from submodule in YANG 1.0

"Acee Lindem (acee)" <acee@cisco.com> Mon, 21 August 2017 14:01 UTC

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From: "Acee Lindem (acee)" <acee@cisco.com>
To: "Ivory, William" <william.ivory@intl.att.com>, "Robert Wilton -X (rwilton - ENSOFT LIMITED at Cisco)" <rwilton@cisco.com>, "'netmod@ietf.org'" <netmod@ietf.org>, Andy Bierman <andy@yumaworks.com>
Thread-Topic: [netmod] Query about augmenting module from submodule in YANG 1.0
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Date: Mon, 21 Aug 2017 14:01:45 +0000
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Subject: Re: [netmod] Query about augmenting module from submodule in YANG 1.0
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Hi William, Rob, Andy,

Given their limited usefulness and the detriments, perhaps we should
discourage the creation of new submodules in RFC6087Bis.

Thanks,
Acee

On 8/21/17, 9:44 AM, "netmod on behalf of Ivory, William"
<netmod-bounces@ietf.org on behalf of william.ivory@intl.att.com> wrote:

>Hi Rob,
>
>That would make it very hard to update existing 1.x YANG models to use
>new features in YANG 2.x if they used submodules.  Maybe that's something
>that no one would ever consider doing anyway, or maybe YANG 1.1 already
>has similar differences to 1.0?  I had (perhaps naively) assumed that you
>could migrate a namespace / model from YANG 1.0 to 2.0?
>
>Regards,
>
>William
>
>-----Original Message-----
>From: netmod [mailto:netmod-bounces@ietf.org] On Behalf Of Robert Wilton
>Sent: 21 August 2017 11:24
>To: netmod@ietf.org
>Subject: Re: [netmod] Query about augmenting module from submodule in
>YANG 1.0
>
>
>
>On 09/08/2017 16:13, Juergen Schoenwaelder wrote:
>> On Wed, Aug 09, 2017 at 05:01:09PM +0200, Ladislav Lhotka wrote:
>>> I remember that in early stages of YANG there was some irrational
>>> fear of introducing too many namespaces, and submodules may be a
>>> consequence of it. As you write, submodules provide no benefits
>>> whatsoever in terms of modularity, but the overhead in terms of
>>> metadata, IANA registration etc. is pretty much the same as for
>>> modules.
>> In case YANG 2.0 is ever done, I suggest someone files a proposal to
>> remove submodules if the cost/benefit ratio is at odds. There is
>> nothing wrong with removing stuff that has been found problematic.
>I agree.
>
>I've added 
>https://urldefense.proofpoint.com/v2/url?u=https-3A__github.com_netmod-2Dw
>g_yang-2Dnext_issues_26&d=DwICAg&c=LFYZ-o9_HUMeMTSQicvjIg&r=p8kyeK3u4ZYiaQ
>2ZPGqwkyXmQgBH6r5jpYiYWzhqJ48&m=l7c4IPL049A2bVVO14fyBMly211xU61xSHgPlAT7ow
>I&s=-kR4fUtXArQy0RwWb32DpT1bP4X_cNqt2zJVoC0JiX8&e=
>
>Rob
>
>>
>> The motivation for submodules was that organizations maintaining large
>> modules with multiple people can do so without having to mess around
>> with tools like m4 scripts to produce a single module from 'snippets'
>> and to avoid integration surprises. But perhaps using m4 scripts and
>> decent version control systems (that can integrate and compile on
>> checkin) is indeed cheaper than having submodules part of the YANG
>> language itself.
>>
>> /js
>>
>
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