Network Working Group M. Bjorklund Internet-Draft Tail-f Systems Intended status: Standards Track L. Berger, Ed. Expires: December 15, 2017 LabN Consulting, L.L.C. June 13, 2017 YANG Tree Diagrams draft-ietf-netmod-yang-tree-diagrams-00 Abstract This document captures the current syntax used in YANG module Tree Diagrams. The purpose of the document is to provide a single location for this definition. This syntax may be updated from time to time based on the evolution of the YANG language. Status of This Memo This Internet-Draft is submitted in full conformance with the provisions of BCP 78 and BCP 79. Internet-Drafts are working documents of the Internet Engineering Task Force (IETF). Note that other groups may also distribute working documents as Internet-Drafts. The list of current Internet- Drafts is at http://datatracker.ietf.org/drafts/current/. 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Bjorklund & Berger Expires December 15, 2017 [Page 1] Internet-Draft YANG Tree Diagrams June 2017 Table of Contents 1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 2 2. Tree Diagram Syntax . . . . . . . . . . . . . . . . . . . . . 2 3. Next Steps . . . . . . . . . . . . . . . . . . . . . . . . . 3 4. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 4 5. Informative References . . . . . . . . . . . . . . . . . . . 4 Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . 4 1. Introduction YANG Tree Diagrams were first published in [RFC7223]. Such diagrams are commonly used to provided a simplified graphical representation of a data model and can be automatically generated via tools such as "pyang". (See ). This document provides the syntax used in YANG Tree Diagrams. It is expected that this document will be updated or replaced as changes to the YANG language, see [RFC7950], necessitate. Today's Common practice is include the definition of the syntax used to represent a YANG module in every document that provides a tree diagram. This practice has several disadvantages and the purpose of the document is to provide a single location for this definition. It is not the intent of this document to restrict future changes, but rather to ensure such changes are easily identified and suitably agreed upon. An example tree diagram can be found in [RFC7223] Section 3. A portion of which follows: +--rw interfaces | +--rw interface* [name] | +--rw name string | +--rw description? string | +--rw type identityref | +--rw enabled? boolean | +--rw link-up-down-trap-enable? enumeration The remainder of this document contains YANG Tree Diagram syntax based on output from pyang version 1.7.1. 2. Tree Diagram Syntax This section provides the meaning of the symbols used in YANG Tree diagrams. Each node in a YANG module is printed as: Bjorklund & Berger Expires December 15, 2017 [Page 2] Internet-Draft YANG Tree Diagrams June 2017 is one of: + for current x for deprecated o for obsolete is one of: rw for configuration data ro for non-configuration data -x for rpcs and actions -n for notifications is the name of the node () means that the node is a choice node :() means that the node is a case node If the node is augmented into the tree from another module, its name is printed as :. is one of: ? for an optional leaf, choice, anydata or anyxml ! for a presence container * for a leaf-list or list [] for a list's keys is the name of the type for leafs and leaf-lists If the type is a leafref, the type is printed as "-> TARGET", where TARGET is either the leafref path, with prefixed removed if possible. is the list of features this node depends on, printed within curly brackets and a question mark "{...}?" 3. Next Steps Authors' note: This draft is currently a bit rough. The next/future version is expected to add text covering different types of trees and when to use them; for example, complete module trees, subtrees, trees for groupings etc. Maybe also how to deal with the limited line lengths in RFCs. Bjorklund & Berger Expires December 15, 2017 [Page 3] Internet-Draft YANG Tree Diagrams June 2017 4. IANA Considerations There are no IANA requests or assignments included in this document. 5. Informative References [RFC7223] Bjorklund, M., "A YANG Data Model for Interface Management", RFC 7223, DOI 10.17487/RFC7223, May 2014, . [RFC7950] Bjorklund, M., Ed., "The YANG 1.1 Data Modeling Language", RFC 7950, DOI 10.17487/RFC7950, August 2016, . Authors' Addresses Martin Bjorklund Tail-f Systems Email: mbj@tail-f.com Lou Berger (editor) LabN Consulting, L.L.C. Email: lberger@labn.net Bjorklund & Berger Expires December 15, 2017 [Page 4]