YANG extension for Common Augmentations

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NETCONF Data Modeling Language                                  L. Bertz
Internet-Draft                                                    Sprint
Intended status: Standards Track                           March 9, 2017
Expires: September 10, 2017

                YANG extension for Common Augmentations


   This document defines a YANG extension to convey common schema

Status of This Memo

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   This Internet-Draft will expire on September 10, 2017.

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   10, 2008.  The person(s) controlling the copyright in some of this
   material may not have granted the IETF Trust the right to allow
   modifications of such material outside the IETF Standards Process.
   Without obtaining an adequate license from the person(s) controlling
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   not be created outside the IETF Standards Process, except to format
   it for publication as an RFC or to translate it into languages other
   than English.

1.  Introduction

   This document provides a mechanism for the specification of an
   augmentation at multiple locations of a YANG schema using the
   extension statement as defined in Section 7.15 of [RFC7950].

   YANG extensions commonly add one augmentation to a common structure.
   Figure 1 shows a small module and another that will be used to extend

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                              ... basemodule {
                                prefix b;
                                grouping base_element {

                                rpc my_rpc {
                                  input {
                                    uses b:base_element;
                                  output {
                                    uses b:base_element;

                                rpc my_bestrpc {
                                  input {
                                    uses b:base_element;

                              ... newstuffmodule {
                                grouping new_things {

                        Figure 1: Reference Modules

   When extending my_rpc in the base module by adding new_things to the
   base element, one must use two augment statements.  If the author of
   the newstuff module wishes to extend base_element then they must
   write an augment statement for every schema location it which it

   An extension with the key word "also-augments" is proposed that
   allows one augment statement to be used for augmentations.
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