Re: [netmod] [Technical Errata Reported] RFC7950 (5663)

Hi Ebben,

I've always taken the ABNF to list the definitive sub-statements that are allowed for the various deviate "add", "replace", or "delete" options.  Perhaps the RFC could state this more explicitly.  Perhaps raise an issue on the YANG Next issue tracker to clarify this (https://github.com/netmod-wg/yang-next/issues) and it might get discussed tomorrow.

Thanks,
Rob

-----Original Message-----
From: netmod <netmod-bounces@ietf.org> On Behalf Of RFC Errata System
Sent: 18 March 2019 18:16
To: mbj@tail-f.com; ibagdona@gmail.com; warren@kumari.net; joelja@bogus.com; kent+ietf@watsen.net; lberger@labn.net
Cc: rfc-editor@rfc-editor.org; netmod@ietf.org
Subject: [netmod] [Technical Errata Reported] RFC7950 (5663)

The following errata report has been submitted for RFC7950, "The YANG 1.1 Data Modeling Language".

--------------------------------------
You may review the report below and at:
http://www.rfc-editor.org/errata/eid5663

--------------------------------------
Type: Technical
Reported by: Ebben Aries <exa@arrcus.com>

Section: 14

Original Text
-------------
deviate-delete-stmt = deviate-keyword sep delete-keyword-str optsep
                      (";" /
                       "{" stmtsep
                           ;; these stmts can appear in any order
                           [units-stmt]
                           *must-stmt
                           *unique-stmt
                           *default-stmt
                       "}") stmtsep

Corrected Text
--------------
deviate-delete-stmt = deviate-keyword sep delete-keyword-str optsep
                      (";" /
                       "{" stmtsep
                           ;; these stmts can appear in any order
                           [units-stmt]
                           *must-stmt
                           *unique-stmt
                           *default-stmt
                           [config-stmt]
                           [mandatory-stmt]
                           [min-elements-stmt]
                           [max-elements-stmt]
                       "}") stmtsep

Notes
-----
Section 7.20.3.2 specifies all permitted substatements for the "deviate" statement however the ABNF grammar specifies different valid substatements per deviate argument.  The "delete" argument is one such that only contains a subset of what is defined in the substatement table in this section.

The errata mentioned at: https://www.rfc-editor.org/errata/eid5489 is meant to correct the following statement

"""
The argument "delete" deletes properties from the target node.  The properties to delete are identified by substatements to the "delete"
statement.
"""

However this either needs to be a per argument table or ABNF correction

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-------------
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--------------------------------------
RFC7950 (draft-ietf-netmod-rfc6020bis-14)
--------------------------------------
Title               : The YANG 1.1 Data Modeling Language
Publication Date    : August 2016
Author(s)           : M. Bjorklund, Ed.
Category            : PROPOSED STANDARD
Source              : Network Modeling
Area                : Operations and Management
Stream              : IETF
Verifying Party     : IESG

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