YANG Module Library
RFC 7895

Document Type RFC - Proposed Standard (June 2016; No errata)
Last updated 2016-06-30
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Internet Engineering Task Force (IETF)                        A. Bierman
Request for Comments: 7895                                     YumaWorks
Category: Standards Track                                   M. Bjorklund
ISSN: 2070-1721                                           Tail-f Systems
                                                               K. Watsen
                                                        Juniper Networks
                                                               June 2016

                          YANG Module Library

Abstract

   This document describes a YANG library that provides information
   about all the YANG modules used by a network management server (e.g.,
   a Network Configuration Protocol (NETCONF) server).  Simple caching
   mechanisms are provided to allow clients to minimize retrieval of
   this information.

Status of This Memo

   This is an Internet Standards Track document.

   This document is a product of the Internet Engineering Task Force
   (IETF).  It represents the consensus of the IETF community.  It has
   received public review and has been approved for publication by the
   Internet Engineering Steering Group (IESG).  Further information on
   Internet Standards is available in Section 2 of RFC 7841.

   Information about the current status of this document, any errata,
   and how to provide feedback on it may be obtained at
   http://www.rfc-editor.org/info/rfc7895.

Copyright Notice

   Copyright (c) 2016 IETF Trust and the persons identified as the
   document authors.  All rights reserved.

   This document is subject to BCP 78 and the IETF Trust's Legal
   Provisions Relating to IETF Documents
   (http://trustee.ietf.org/license-info) in effect on the date of
   publication of this document.  Please review these documents
   carefully, as they describe your rights and restrictions with respect
   to this document.  Code Components extracted from this document must
   include Simplified BSD License text as described in Section 4.e of
   the Trust Legal Provisions and are provided without warranty as
   described in the Simplified BSD License.

Bierman, et al.              Standards Track                    [Page 1]
RFC 7895                      YANG Library                     June 2016

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
     1.1.  Terminology . . . . . . . . . . . . . . . . . . . . . . .   3
     1.2.  Tree Diagrams . . . . . . . . . . . . . . . . . . . . . .   3
   2.  YANG Module Library . . . . . . . . . . . . . . . . . . . . .   4
     2.1.  modules-state . . . . . . . . . . . . . . . . . . . . . .   4
       2.1.1.  modules-state/module-set-id . . . . . . . . . . . . .   4
       2.1.2.  modules-state/module  . . . . . . . . . . . . . . . .   5
     2.2.  YANG Library Module . . . . . . . . . . . . . . . . . . .   5
   3.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .  11
     3.1.  YANG Module Registry  . . . . . . . . . . . . . . . . . .  11
   4.  Security Considerations . . . . . . . . . . . . . . . . . . .  11
   5.  References  . . . . . . . . . . . . . . . . . . . . . . . . .  12
     5.1.  Normative References  . . . . . . . . . . . . . . . . . .  12
     5.2.  Informative References  . . . . . . . . . . . . . . . . .  12
   Acknowledgements  . . . . . . . . . . . . . . . . . . . . . . . .  13
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .  13

1.  Introduction

   There is a need for standard mechanisms to identify the YANG modules
   and submodules that are in use by a server that implements YANG data
   models.  If a large number of YANG modules are utilized by the
   server, then the YANG library contents needed can be relatively
   large.  This information changes very infrequently, so it is
   important that clients be able to cache the YANG library contents and
   easily identify whether their cache is out of date.

   YANG library information can be different on every server and can
   change at runtime or across a server reboot.

   If the server implements multiple protocols to access the YANG-
   defined data, each such protocol has its own conceptual instantiation
   of the YANG library.

   The following information is needed by a client application (for each
   YANG module in the library) to fully utilize the YANG data modeling
   language:

   o  name: The name of the YANG module.

   o  revision: Each YANG module and submodule within the library has a
      revision.  This is derived from the most recent revision statement
      within the module or submodule.  If no such revision statement
      exists, the module's or submodule's revision is the zero-length
      string.

Bierman, et al.              Standards Track                    [Page 2]
RFC 7895                      YANG Library                     June 2016

   o  submodule list: The name and revision of each submodule used by
      the module MUST be identified.
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