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Re: [netmod] Interaction of 'when' and 'default' statements

Phil Shafer <phil@juniper.net> Thu, 23 March 2017 20:28 UTC

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To: William Ivory <wivory@Brocade.com>
CC: "Dale R. Worley" <worley@ariadne.com>, Martin Bjorklund <mbj@tail-f.com>, Nick Brown <brownn@Brocade.com>, "netmod@ietf.org" <netmod@ietf.org>
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Date: Thu, 23 Mar 2017 16:24:04 -0400
From: Phil Shafer <phil@juniper.net>
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Archived-At: <https://mailarchive.ietf.org/arch/msg/netmod/HEF0Ai_WwE8ylJFZe3oZFdctXDo>
Subject: Re: [netmod] Interaction of 'when' and 'default' statements
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William Ivory writes:
>Yes, I'd noticed that.  Does this make the behaviour 'undefined' in YANG 1.0?

No, this was a clarification.  The text in 6020 was reasonably clear:

   The "when" statement makes its parent data definition statement
   conditional.  The node defined by the parent data definition
   statement is only valid when the condition specified by the "when"
   statement is satisfied.

And no default should be provided for any invalid node.  If the node
can't exist, the default can't either.

Thanks,
 Phil

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