Extension:EntitySchema

**MediaWiki extensions manual**
EntitySchema; Release status: stable
Implementation	ContentHandler, Page action, Special page, API
Description	Allows to store Shape Expression Schemas on wiki pages
Author(s)	The Wikidata team
Latest version	continuous updates
Compatibility policy	Snapshots releases along with MediaWiki. Master is not backward compatible.
MediaWiki	master
Database changes	Yes
	Tables entityschema_id_counter;
	Parameters $wgEntitySchemaSkippedIDs; $wgEntitySchemaNameBadgeMaxSizeChars; $wgEntitySchemaSchemaTextMaxSizeBytes; $wgEntitySchemaIsRepo; $wgEntitySchemaShExSimpleUrl;
	Hooks used BeforeDisplayNoArticleText; CanonicalNamespaces; ContentHandlerForModelID; ContentModelCanBeUsedOn; ExtensionTypes; FormatAutocomments; GetContentModels; HtmlPageLinkRendererEnd; ImportHandleRevisionXMLTag; LoadExtensionSchemaUpdates; OutputPageParserOutput; PageHistoryLineEnding; ResourceLoaderRegisterModules; SidebarBeforeOutput; SkinTemplateNavigation::Universal; SpecialPage_initList; TitleGetRestrictionTypes; WikibaseClientDataTypes; WikibaseRepoDataTypes; WikibaseRepoEntitySearchHelperCallbacks; WikibaseRepoOnParserOutputUpdaterConstruction; WikibaseRepoSearchableEntityScopes; WikibaseRepoSearchableEntityScopesMessages; WikibaseRepoWbui2025InitResourceDependenciesHook;
License	GNU General Public License 2.0 or later
Download	Download extension ; Git [?]: Browse repository (GitHub); Gerrit code review; Git commit log; Download source tarball; ; readme
	Translate the EntitySchema extension
Issues	Open tasks · Report a bug

The EntitySchema extension allows storing Shape Expressions Schemas on wiki pages (using ShExC syntax), as well as validating entities against those Schemas using the ShEx2 — Simple Online Validator. For more information on enabling this second part, see #Configuration.

Installation

Download and move the extracted EntitySchema 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/EntitySchema
```
Only when installing from Git, run Composer to install PHP dependencies, by issuing composer install --no-dev in the extension directory. (See T173141 for potential complications.)
Add the following code at the bottom of your LocalSettings.php file:
```
wfLoadExtension( 'EntitySchema' );
```
Configure as required.
Done – Navigate to Special:Version on your wiki to verify that the extension is successfully installed.

Prerequisites for displaying the optional "check entities against this Schema" link on the Schema page:

In your "LocalSettings.php", set $wgEntitySchemaShExSimpleUrl to a non-empty string which represents the external verification tool to use (e.g. https://tools.wmflabs.org/shex-simple/wikidata/doc/shex-simple.html).
The link is only displayed on pages where the Schema text is not empty