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Re: [netmod] xpath for must statements

Martin Bjorklund <mbj@tail-f.com> Wed, 08 August 2018 07:41 UTC

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Date: Wed, 08 Aug 2018 09:41:24 +0200
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To: william.ivory@intl.att.com
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From: Martin Bjorklund <mbj@tail-f.com>
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Subject: Re: [netmod] xpath for must statements
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Hi,

"Ivory, William" <william.ivory@intl.att.com> wrote:
> On 07/08/18 23:01, Acee Lindem (acee) wrote:
> Is it possible to indicate that choice statement must be specified in a YANG 1.1 “must” clause w/o specifying every case? Similarly, it is there a way specify that a container cannot be empty in “must” clause?
> Thanks,
> Acee
> 
> For the second, just check the container has children:
> 
>     must "<path_to_container>/*";

Note that if the container has an NP-container as a child, this
expression will always return true (even if that NP-container is
empty), since NP-containers exists in XPath evaluations (see 6.4.1 in
RFC 7950).

If there are no NP-containers the expression works -- except that it
doesn't work if someone augments an NP-container into this container.


/martin


> 
> Regards,
> 
> William
> 
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