Extension:Metadata

**MediaWiki extensions manual**
Metadata; Release status: experimental
Description	Adds #metadata parser function to set page properties, and expose them via ‎<meta> tags and a REST API endpoint
Author(s)	Sophivorustalk
Latest version	4.0
MediaWiki	>= 1.39.4
	Hooks used OutputPageParserOutput; ParserFirstCallInit;
License	GNU General Public License 3.0 or later
Download	Download extension ; Git [?]: Browse repository (GitHub); Gerrit code review; Git commit log; Download source tarball;
	Translate the Metadata extension if it is available at translatewiki.net

The Metadata extension adds the #metadata parser function to set page properties, and exposes them via ‎<meta> tags and a REST API endpoint.

Installation

Download and move the extracted Metadata folder to your extensions/ directory.
Developers and code contributors should install the extension from Git instead, using:
```
cd extensions/
git clone https://gerrit.wikimedia.org/r/mediawiki/extensions/Metadata
```
Add the following code at the bottom of your LocalSettings.php file:
```
wfLoadExtension( 'Metadata' );
```
Done – Navigate to Special:Version on your wiki to verify that the extension is successfully installed.

To set a simple key-value pair for the current page:

{{#metadata:key=value}}

And to set multiple key-value pairs in a single call:

{{#metadata:
| key = value
| foo = bar
| baz
}}

Keys with no value will be assigned a "1" value.

Once set, the properties will be accessible via the HTML <meta> tags, like so:

<meta name="key" content="value" />
<meta name="foo" content="bar" />
<meta name="baz" content="1" />

And also, via the "props" endpoint introduced by this extension to the MediaWiki REST API, with the following URL pattern:

/w/rest.php/v1/page/{title}/props

Finally, the properties can also be accessed via the Properties module of the MediaWiki Action API, with the following URL pattern:

/w/api.php?action=query&prop=pageprops&titles={title}