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Re: [Netconf] YANG Doctor question: empty mandatory choice?

"Eric Voit (evoit)" <evoit@cisco.com> Fri, 03 August 2018 20:32 UTC

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From: "Eric Voit (evoit)" <evoit@cisco.com>
To: Kent Watsen <kwatsen@juniper.net>, "Einar Nilsen-Nygaard (einarnn)" <einarnn@cisco.com>
CC: Alexander Clemm <alexander.clemm@huawei.com>, Martin Bjorklund <mbj@tail-f.com>, "netconf@ietf.org" <netconf@ietf.org>
Thread-Topic: [Netconf] YANG Doctor question: empty mandatory choice?
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Date: Fri, 03 Aug 2018 20:32:11 +0000
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Subject: Re: [Netconf] YANG Doctor question: empty mandatory choice?
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From: Kent Watsen, August 3, 2018 2:51 PM


> Agreed. Let’s just move past this issue

But what about this comment?

What I object to is the way that this restriction is currently implemented using identities, which requires the "notif" models to do something right.  Better would be a "must" expression that says the count of the descendants is exactly one.  Can you do that?

I'm not that familiar with XPath expressions, but would something like this work?

            must "count(distinct-values(//sn:receivers/sn:receiver)) = 1"

I don’t know how this would work as what you would be checking to see is if the augmented transport choice case types are common across all receivers.

Based on empty mandatory choice being ok, I have posted a new –v15 of SN.

https://www.ietf.org/internet-drafts/draft-ietf-netconf-subscribed-notifications-15.txt


If someone figures the XPATH to do what Kent suggests above, it can be seamlessly added.   But if nothing comes up, we can still progress using the earlier proposed solution.

Eric


Kent // contributor

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