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

"Jernej Tuljak" <jernej.tuljak@mg-soft.si> Wed, 15 February 2017 10:17 UTC

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From: Jernej Tuljak <jernej.tuljak@mg-soft.si>
To: 'Alex Campbell' <Alex.Campbell@Aviatnet.com>, "'Martin Ciglan -X (mciglan - PANTHEON TECHNOLOGIES at Cisco)'" <mciglan@cisco.com>
References: <1487080134376.87476@cisco.com> <1487105934602.29661@Aviatnet.com>
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Date: Wed, 15 Feb 2017 11:16:52 +0100
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Cc: "'Igor Foltin -X (ifoltin - PANTHEON TECHNOLOGIES at Cisco)'" <ifoltin@cisco.com>, netmod@ietf.org
Subject: Re: [netmod] Yang 1.1 change: Allow type "empty" in a key.
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Plus, "empty keys" were aready allowed in YANG 1.

 

module empty-key {

  namespace "org:example:empty-key";

  prefix "ek";

 

  container stuff {

    list item {

      key "first second";

      leaf first {

        type string {

          length 0;

        }

      }

      leaf second {

        type string {

          pattern '.{0}';

        }

      }

    }

  }

}

 

Therefore this change removed a redundant (perhaps even broken) rule.

 

https://www.ietf.org/mail-archive/web/netmod/current/msg16763.html

Jernej

 

From: netmod [mailto:netmod-bounces@ietf.org] On Behalf Of Alex Campbell
Sent: Tuesday, February 14, 2017 9:59 PM
To: Martin Ciglan -X (mciglan - PANTHEON TECHNOLOGIES at Cisco) <mciglan@cisco.com>
Cc: Igor Foltin -X (ifoltin - PANTHEON TECHNOLOGIES at Cisco) <ifoltin@cisco.com>; netmod@ietf.org
Subject: Re: [netmod] Yang 1.1 change: Allow type "empty" in a key.

 

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 <mailto:netmod-bounces@ietf.org> > on behalf of Martin Ciglan -X (mciglan - PANTHEON TECHNOLOGIES at Cisco) <mciglan@cisco.com <mailto:mciglan@cisco.com> >
Sent: Wednesday, 15 February 2017 2:48 a.m.
To: netmod@ietf.org <mailto: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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