Defining and Using Metadata with YANG
RFC 7952
| Document | Type |
RFC - Proposed Standard
(August 2016; No errata)
Updates RFC 6110
|
|
|---|---|---|---|
| Last updated | 2016-08-31 | ||
| Replaces | draft-lhotka-netmod-yang-metadata | ||
| Stream | IETF | ||
| Formats | plain text pdf html bibtex | ||
| Yang Validation | ☯ 0 errors, 0 warnings. | ||
| Reviews | |||
| Stream | WG state | Submitted to IESG for Publication | |
| Document shepherd | Kent Watsen | ||
| Shepherd write-up | Show (last changed 2016-02-23) | ||
| IESG | IESG state | RFC 7952 (Proposed Standard) | |
| Consensus Boilerplate | Yes | ||
| Telechat date | |||
| Responsible AD | Benoit Claise | ||
| Send notices to | (None) | ||
| IANA | IANA review state | Version Changed - Review Needed | |
| IANA action state | RFC-Ed-Ack | ||
Internet Engineering Task Force (IETF) L. Lhotka
Request for Comments: 7952 CZ.NIC
Updates: 6110 August 2016
Category: Standards Track
ISSN: 2070-1721
Defining and Using Metadata with YANG
Abstract
This document defines a YANG extension that allows for defining
metadata annotations in YANG modules. The document also specifies
XML and JSON encoding of annotations and other rules for annotating
instances of YANG data nodes.
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/rfc7952.
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 7952 YANG Metadata August 2016
Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 3
2. Terminology . . . . . . . . . . . . . . . . . . . . . . . . . 5
2.1. Key Words . . . . . . . . . . . . . . . . . . . . . . . . 5
2.2. Terms Defined in Other Documents . . . . . . . . . . . . 5
2.3. Namespaces and Prefixes . . . . . . . . . . . . . . . . . 7
2.4. Definitions of New Terms . . . . . . . . . . . . . . . . 7
3. Defining Annotations in YANG . . . . . . . . . . . . . . . . 8
3.1. Example Definition . . . . . . . . . . . . . . . . . . . 9
4. Using Annotations . . . . . . . . . . . . . . . . . . . . . . 9
5. The Encoding of Annotations . . . . . . . . . . . . . . . . . 10
5.1. XML Encoding . . . . . . . . . . . . . . . . . . . . . . 10
5.2. JSON Encoding . . . . . . . . . . . . . . . . . . . . . . 11
5.2.1. Metadata Object and Annotations . . . . . . . . . . . 11
5.2.2. Adding Annotations to anydata, container, and list
Entries . . . . . . . . . . . . . . . . . . . . . . . 12
5.2.3. Adding Annotations to anyxml and leaf Instances . . . 12
5.2.4. Adding Annotations to leaf-list Entries . . . . . . . 13
6. Representing Annotations in DSDL Schemas . . . . . . . . . . 14
7. Metadata YANG Module . . . . . . . . . . . . . . . . . . . . 16
8. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 18
9. Security Considerations . . . . . . . . . . . . . . . . . . . 18
10. References . . . . . . . . . . . . . . . . . . . . . . . . . 19
10.1. Normative References . . . . . . . . . . . . . . . . . . 19
10.2. Informative References . . . . . . . . . . . . . . . . . 20
Acknowledgements . . . . . . . . . . . . . . . . . . . . . . . . 21
Author's Address . . . . . . . . . . . . . . . . . . . . . . . . 21
Lhotka Standards Track [Page 2]
RFC 7952 YANG Metadata August 2016
1. Introduction
There is a need to be able to annotate instances of YANG [RFC7950]
data nodes with metadata. Typical use cases are as follows:
o Complementing regular data model information with
instance-specific metadata, comments, etc.
o Providing information about the rendering of data in user
interfaces.
o Deactivating a subtree in a configuration datastore while keeping
the data in place.
o Network management protocols often use metadata annotations for
various purposes in both operation requests and responses. For
example, the <edit-config> operation in the Network Configuration
Protocol (NETCONF) (see Section 7.2 of [RFC6241]) uses annotations
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