NETCONF Data Modeling Language Q. Chen Internet-Draft M. Du Intended status: Informational ZTE Corporation Expires: April 21, 2011 Oct 18, 2010 Extending YANG with Revised Types draft-chen-netmod-yang-ext-00 Abstract YANG - the NETCONF Data Modeling Language - supports modeling of a tree of data elements that represent the configuration and runtime status of a particular network element managed via NETCONF. This document introduces new idea which revises the ID [draft-linowski-netmod-yang-abstract-03] and clears some ambiguous concepts and descrptions. 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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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 Chen & Du Expires April 21, 2011 [Page 1] Internet-Draft YANG Extension Oct 2010 described in the Simplified BSD License. Table of Contents 1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . . 3 1.1. Conventions used in this document . . . . . . . . . . . . . 3 2. Redefing type in YANG abstract . . . . . . . . . . . . . . . . 3 3. Revised types in yang-abstract . . . . . . . . . . . . . . . . 3 3.1. Removing confusion . . . . . . . . . . . . . . . . . . . . 3 3.2. Result . . . . . . . . . . . . . . . . . . . . . . . . . . 4 4. Management Consideration . . . . . . . . . . . . . . . . . . . 4 5. Security Considerations . . . . . . . . . . . . . . . . . . . . 4 6. IANA Considerations . . . . . . . . . . . . . . . . . . . . . . 4 Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . . 4 Chen & Du Expires April 21, 2011 [Page 2] Internet-Draft YANG Extension Oct 2010 1. Introduction [draft-linowski-netmod-yang-abstract-03] suggests to enhance YANG with supplementary modeling features and language abstractions with the aim to improve the model extensibility and reuse. However, some ideas and description are not defined clearly,this memo tries to amend the concepts and gives some suggestions. 1.1. Conventions used in this document The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT", "SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this document are to be interpreted as described in [RFC2119]. 2. Redefing type in YANG abstract section "2.3. instance extension statement" and "2.4. instance-list extension statement", the table of substatement list out that "type" is allowed, but "instance-type" is not listed. so it is conflict with what is wrote in section 3.2. instance-type extension statement. suggest that "instance-type" is need not defined, use "type" instead, and give description in section 2.3 and 2.4 3. Revised types in yang-abstract 3.1. Removing confusion There exists difference between types of a list and types of the node of the list,and both types are being used in application implementation. But in YANG and yang-abstract, it is not distinguished. It will cause confusion in complehension and implementation . So it is strongly suggested do not introduce subtree/subtype/field in list definition, that is in "draft-linowski-netmod-yang-abstract-03.txt" , section "2.4. instance-list extension statement" remove choice , container,instance,instance-list,leaf ,leaf-list,list in substatment table, only "type" for use a complex-type is allowed. Chen & Du Expires April 21, 2011 [Page 3] Internet-Draft YANG Extension Oct 2010 3.2. Result +---------------+-------------+ | substatement | cardinality | +---------------+-------------+ | description | 0..1 | | config | 0..1 | | if-feature | 0..n | | mandatory | 0..1 | | must | 0..n | | reference | 0..1 | | status | 0..1 | | type | 1 | +---------------+-------------+ Figure 1: instance's substatements 4. Management Consideration 5. Security Considerations TBD 6. IANA Considerations TBD Authors' Addresses Qiaogang Chen ZTE Corporation 3/F, R.D. Building 3, ZTE Industrial Park, Liuxian Road Shenzhen 518055 P.R.China Phone: +86 755 26773712 Email: chen.qiaogang@zte.com.cn URI: http://www.zte.com.cn/ Chen & Du Expires April 21, 2011 [Page 4] Internet-Draft YANG Extension Oct 2010 Ming Du ZTE Corporation 3/F, R.D. Building 3, ZTE Industrial Park, Liuxian Road Shenzhen 518055 P.R.China Phone: +86 755 26773712 Email: du.ming@zte.com.cn URI: http://www.zte.com.cn/ Chen & Du Expires April 21, 2011 [Page 5]