JSON Encoding of Data Modeled with YANG
RFC 7951

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Internet Engineering Task Force (IETF)                         L. Lhotka
Request for Comments: 7951                                        CZ.NIC
Category: Standards Track                                    August 2016
ISSN: 2070-1721

                JSON Encoding of Data Modeled with YANG

Abstract

   This document defines encoding rules for representing configuration
   data, state data, parameters of Remote Procedure Call (RPC)
   operations or actions, and notifications defined using YANG as
   JavaScript Object Notation (JSON) text.

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/rfc7951.

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.

Lhotka                       Standards Track                    [Page 1]
RFC 7951               JSON Encoding of YANG Data            August 2016

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   3
   2.  Terminology and Notation  . . . . . . . . . . . . . . . . . .   3
   3.  Properties of the JSON Encoding . . . . . . . . . . . . . . .   4
   4.  Names and Namespaces  . . . . . . . . . . . . . . . . . . . .   5
   5.  Encoding of YANG Data Node Instances  . . . . . . . . . . . .   7
     5.1.  The "leaf" Data Node  . . . . . . . . . . . . . . . . . .   7
     5.2.  The "container" Data Node . . . . . . . . . . . . . . . .   8
     5.3.  The "leaf-list" Data Node . . . . . . . . . . . . . . . .   8
     5.4.  The "list" Data Node  . . . . . . . . . . . . . . . . . .   9
     5.5.  The "anydata" Data Node . . . . . . . . . . . . . . . . .   9
     5.6.  The "anyxml" Data Node  . . . . . . . . . . . . . . . . .  10
     5.7.  Metadata Objects  . . . . . . . . . . . . . . . . . . . .  11
   6.  Representing YANG Data Types in JSON Values . . . . . . . . .  11
     6.1.  Numeric Types . . . . . . . . . . . . . . . . . . . . . .  11
     6.2.  The "string" Type . . . . . . . . . . . . . . . . . . . .  11
     6.3.  The "boolean" Type  . . . . . . . . . . . . . . . . . . .  11
     6.4.  The "enumeration" Type  . . . . . . . . . . . . . . . . .  12
     6.5.  The "bits" Type . . . . . . . . . . . . . . . . . . . . .  12
     6.6.  The "binary" Type . . . . . . . . . . . . . . . . . . . .  12
     6.7.  The "leafref" Type  . . . . . . . . . . . . . . . . . . .  12
     6.8.  The "identityref" Type  . . . . . . . . . . . . . . . . .  12
     6.9.  The "empty" Type  . . . . . . . . . . . . . . . . . . . .  13
     6.10. The "union" Type  . . . . . . . . . . . . . . . . . . . .  14
     6.11. The "instance-identifier" Type  . . . . . . . . . . . . .  15
   7.  I-JSON Compliance . . . . . . . . . . . . . . . . . . . . . .  15
   8.  Security Considerations . . . . . . . . . . . . . . . . . . .  16
   9.  References  . . . . . . . . . . . . . . . . . . . . . . . . .  16
     9.1.  Normative References  . . . . . . . . . . . . . . . . . .  16
     9.2.  Informative References  . . . . . . . . . . . . . . . . .  17
   Appendix A.  A Complete Example . . . . . . . . . . . . . . . . .  18
   Acknowledgements  . . . . . . . . . . . . . . . . . . . . . . . .  20
   Author's Address  . . . . . . . . . . . . . . . . . . . . . . . .  20

Lhotka                       Standards Track                    [Page 2]
RFC 7951               JSON Encoding of YANG Data            August 2016

1.  Introduction

   The Network Configuration Protocol (NETCONF) [RFC6241] uses XML [XML]
   for encoding data in its Content Layer.  Other management protocols
   might want to use other encodings while still benefiting from using
   YANG [RFC7950] as the data modeling language.

   For example, the RESTCONF protocol [RESTCONF] supports two encodings:
   XML (media type "application/yang.data+xml") and JavaScript Object
   Notation (JSON) (media type "application/yang.data+json").

   The specification of the YANG 1.1 data modeling language [RFC7950]