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Re: [netmod] YANG 1.0 behavior for leafref

Anees Shaikh <aashaikh@google.com> Tue, 15 September 2015 23:28 UTC

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Date: Tue, 15 Sep 2015 16:28:37 -0700
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From: Anees Shaikh <aashaikh@google.com>
To: Andy Bierman <andy@yumaworks.com>
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Cc: "netmod@ietf.org" <netmod@ietf.org>
Subject: Re: [netmod] YANG 1.0 behavior for leafref
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Isn't there already a verified errata for this same issue with the same
recommendation (Errata ID: 2949) ?

-- Anees

On Tue, Sep 15, 2015 at 3:15 PM, Andy Bierman <andy@yumaworks.com> wrote:

> Hi,
>
> The leafref text was changed to allow the require-instance-stmt in YANG 1.1
>
> RFC 6020, sec. 9.9. is quite clear that this sub-statement is not allowed.
>
> 9.9.1.  Restrictions
>
>    A leafref cannot be restricted.
>
> 9.13.1.  Restrictions
>
>    An instance-identifier can be restricted with the "require-instance"
>    statement (Section 9.13.2).
>
>
> However, the ABNF on page 149 clearly contradicts the text in 9.9.1:
>
>   leafref-specification =
>                          ;; these stmts can appear in any order
>                          path-stmt stmtsep
>                          [require-instance-stmt stmtsep]
>
>    path-stmt           = path-keyword sep path-arg-str stmtend
>
>    require-instance-stmt = require-instance-keyword sep
>                             require-instance-arg-str stmtend
>
>
>
> So which normative text is correct?
> Is instance-required-stmt allowing in YANG 1.0?
>
>
> Andy
>
>
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