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Re: [netmod] Yang 1.1 change: Allow type "empty" in a key.

Alex Campbell <Alex.Campbell@Aviatnet.com> Tue, 14 February 2017 20:58 UTC

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From: Alex Campbell <Alex.Campbell@Aviatnet.com>
To: "Martin Ciglan -X (mciglan - PANTHEON TECHNOLOGIES at Cisco)" <mciglan@cisco.com>
Thread-Topic: Yang 1.1 change: Allow type "empty" in a key.
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Date: Tue, 14 Feb 2017 20:58:54 +0000
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Cc: "Igor Foltin -X (ifoltin - PANTHEON TECHNOLOGIES at Cisco)" <ifoltin@cisco.com>, "netmod@ietf.org" <netmod@ietf.org>
Subject: Re: [netmod] Yang 1.1 change: Allow type "empty" in a key.
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Hi,


It means exactly what the summary says. In YANG 1.0 (RFC 6020) we have:

   A leaf that is part of the key can be of any built-in or derived
   type, except it MUST NOT be the built-in type "empty".

and in YANG 1.1 (RFC 7950) we have:

   A leaf that is part of the key can be of any built-in or
   derived type.

In YANG 1.1, leaves of type "empty" are not disallowed from being keys.

Note that since leaves of type "empty" only convey information through their presence or absence, and since
key leaves must always be present, key leaves of type "empty" convey no useful information.



Alex



________________________________
From: netmod <netmod-bounces@ietf.org> on behalf of Martin Ciglan -X (mciglan - PANTHEON TECHNOLOGIES at Cisco) <mciglan@cisco.com>
Sent: Wednesday, 15 February 2017 2:48 a.m.
To: netmod@ietf.org
Cc: Igor Foltin -X (ifoltin - PANTHEON TECHNOLOGIES at Cisco)
Subject: [netmod] Yang 1.1 change: Allow type "empty" in a key.


Hi all


Yang 1.1 change:  Allow type "empty" in a key.


What is the meaning of this change? We're interested from implementation point of view.


  Thanks


       Martin

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