Table of Contents

Overview

The following study describes extending YANG language statements to allow customization of models.

References:

Jira
server ONAP Jira
serverId 425b2b0a-557c-3c0c-b515-579789cceedb
key CPS-735
https://datatracker.ietf.org/doc/rfc8526/
https://www.rfc-editor.org/rfc/rfc6095.html
https://www.hjp.at/doc/rfc/rfc6020.html#sec_6.3.1
https://docs.opendaylight.org/en/latest/release-notes/upgrade-process.html?highlight=extension%20annotation#unrecognized-yang-statement-handling
https://datatracker.ietf.org/doc/html/rfc6110#section-9.4
https://datatracker.ietf.org/doc/html/rfc8791

YANG Language

The YANG language provides us the ability to define and model configurations and state data by defining YANG modules
- Modules contain a sequence of statements
  - Statement syntax is either of the following :
    - statement = keyword [argument] ;
    - statement = keyword [argument] { <substatement(s)..> } ;

...

Figure 1.1 Schema tree of module 'stores'

Code Block

language	xml
title	Schema tree of module stores

stores module schema tree

YANG extension Statement

** the YIN version and Schema trees above are generated by YANG validator 'pyang'

...

Contains interface which has methods to access data of a YANG extension statement

package org.opendaylight.yangtools.yang.model.api;
import org.opendaylight.yangtools.yang.model.api.stmt.ExtensionEffectiveStatement;
public interface ExtensionDefinition extends SchemaNode, EffectiveStatementEquivalent<ExtensionEffectiveStatement> {
    String getArgument();
    boolean isYinElement();
}