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[netmod] Does YANG allow forward references to groupings?

William Ivory <wivory@Brocade.com> Thu, 27 October 2016 10:49 UTC

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From: William Ivory <wivory@Brocade.com>
To: "netmod@ietf. org netmod@ietf.org netmod@ietf. org (netmod@ietf.org)" <netmod@ietf.org>
Thread-Topic: Does YANG allow forward references to groupings?
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Date: Thu, 27 Oct 2016 10:48:46 +0000
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Subject: [netmod] Does YANG allow forward references to groupings?
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Hi,

I'd appreciate clarification on whether a YANG grouping defined and used in the same file must have the grouping definition first, before the 'uses' statement.

On the one hand, RFC 6020 section 7.11 states: 'Once a grouping is defined, it can be referenced in a "uses" statement', suggesting a C / C++ -style which doesn't allow forward references.  (https://tools.ietf.org/html/rfc6020#section-7.11)

On the other hand, section 6.2 states 'Forward references are allowed in YANG.' (https://tools.ietf.org/html/rfc6020#section-6.2).

I am assuming that the second, more explicit, statement trumps the first, but would appreciate confirmation.

Thanks,

William

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