Page Comparison

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Sample YANG

(stores.yang with extension)

Statements and Description

Code Block

language	yml
title	stores model with extension
linenumbers	true

module storessync-enxtension {
…
prefix booksync-storeex;
…
   extension sync-flag{
     description
           “This is a sample extension statement description“
      argument "value";
   }
container bookstore { 
        leaf bookstore-name {
            type string;
        }
….
}

Code Block

language	yml
title	extended-stores model
linenumbers	true

module extended-stores {
    yang-version 1.1;
	...
    import storessync-extension{
	    prefix booksync-storeex;
	}

    typedef year {
        type uint16 {
            range "1000..9999";
        }
    }

    container bookstore {
        book-store:sync-flag "on";
    ...
	}
}

extension Statement

see example from Lines 5-9 on stores model with extension

Syntax

Code Block

language	text

extension <keyword/identifier>{
     <extension substatements...>
}

Usage

see example from Line 15 on extended-stores model

Code Block

language	text

<module prefix>:<extension keyword> "argument";

to be used to define new statements
available to be imported and used by other modules just like a normal YANG statement
- - by use of 'import statement' to import the module where the extension is defined
statements that do not have any substatements can have extensions defined if wanted
its only one argument is the identifier and keyword for the extension
Optional substatements:
- - argument Statement
  - description Statement
  - reference Statement
  - defined extension Statements

argument Statement

see examples from Line 6 on stores model

takes a string argument which is the name of the argument to the keyword
Optional substatement
- - yin-element Statement

Code Block

language	xml
theme	Midnight
title	YIN-extended-stores model
linenumbers	true

<?xml version="1.0" encoding="UTF-8"?>
<module name="extended-stores"
        xmlns="urn:ietf:params:xml:ns:yang:yin:1"
        xmlns:ext-book-store="org:onap:ccsdk:sampleExtended"
        xmlns:book-store="org:onap:ccsdk:sample">
  <namespace uri="org:onap:ccsdk:sampleExtended"/>
  <prefix value="ext-book-store"/>
  <revision date="2020-09-15">
    <description>
      <text>Sample Extended Model</text>
    </description>
  </revision>
  <import module="stores">
    <prefix value="book-store"/>
  </import>
  <typedef name="year">
    <type name="uint16">
      <range value="1000..9999"/>
    </type>
  </typedef>
  <container name="bookstore">
    <book-store:sync-flag value="on"/>
    <leaf name="bookstore-name">
      <type name="string"/>
    </leaf>
	...
  </container>
</module>

yin-element Statement

takes a string argument which is true or false
yin-element is 'false' by default
if the argument is 'true' it indicates that the argument is mapped to an XML element in YIN or to an XML attribute

Notes

Line 22 on YIN-extended-stores model
1. result of using the argument without specifying the yin-element value
  1. yin-element is 'false'
  2. the argument 'value' is only an XML attribute

if argument statement (Line 6 on stores model) contains yin-element substatement YIN-extend-stores model would result to the following:

extension statement will produce a child node

Code Block

theme	Midnight
title	YIN-extended-stores model where yin-element is 'true'

...
  <container name="bookstore">
    <book-store:sync-flag>
      <book-store:value>on</book-store:value>
    </book-store:sync-flag>
...
  </container>
...

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Versions Compared

Old Version 31

New Version 32

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