**Reason**
It is no longer maintained, and the functionality has been replaced by a combination of extension DisplayTitle and functionality added to extension Semantic MediaWiki.
**To-do list**
- This task
-- [x] Add maintainers of that extension/skin as subscribers to this task (if they have no apparent Phabricator account, notify them on-wiki or via email if possible and note it here).
-- [x] Add Phabricator project <#ProjectX> as a tag for this task, or #mediawiki-extensions-other/#other-skins if there is no project.
- On-wiki documentation
-- [x] Archive documentation on `mediawiki.org` (provide URL): replace page contents with `{{TNT|Archived extension|last revision id before archiving|reason=archive reasons, per [[phab:T######]]}}` (for extensions)/`{{TNT|Archived skin|last revision|reason=archive reasons, per [[phab:T######]]}}` (for skins); include a link to this task in the `reason` parameter.
-- [x] If documentation page was translatable, remove `<translate>`, visit Special:PageTranslation, and click "remove from translation" (if you don't have the translation administrator right, ask a [[ https://www.mediawiki.org/wiki/Special:ListUsers/translationadmin | user who does ]]).
-- [ ] Update Wikidata item associated with documentation page
--- [ ] add statement `Abandonware (Q281039)` to `instance of (P31)` together with qualifier `start time (P580)` = the YYYY-MM-DD (date that you decided to archive extension/skin generally per edit history)
--- [ ] add qualifier `end time (P582)` = the YYYY-MM-DD (same date as above) to `instance of (P31) = MediaWiki extension (Q6805426)/MediaWiki skin (Q21996535)`
- Phabricator
-- [x] Archive Phabricator project <#ProjectX> for the extension/skin. https://phabricator.wikimedia.org/project/profile/856/
-- [x] Mark all Phabricator tasks for the extension/skin either Declined or Invalid. (except those related to archiving the extension)
-- [x] Edit Phabricator project <#ProjectX> description for the extension/skin with a link to this ticket.
- Translatewiki.net/translations
-- [ ] ~~Remove from `translatewiki.net` (`groups/MediaWiki/mediawiki-extensions.txt` / `groups/MediaWiki/mediawiki-skins.txt`) (add #translatewiki.net project as a tag for this task). !!(see T229425)!!~~
- Configuration/tests/integrations/etc.
-- [x] Remove from `mediawiki/extensions` / `mediawiki/skins` (along with in `.gitmodules`). – https://gerrit.wikimedia.org/r/526682
-- [x] Remove tests in [[ https://gerrit.wikimedia.org/g/integration/config | `integration/config` ]] (`zuul/layout.yaml`) – https://gerrit.wikimedia.org/r/526690
-- [ ] ~~Remove manifest/other references from `mediawiki/vagrant` if they exist.~~
-- [ ] ~~Remove from https://doc.wikimedia.org/cover-extensions/ if present (requires #continuous-integration-infrastructure shell user to delete directly from the server).~~
- Repositories
-- [x] Empty repository leaving only the README indicating the repo is archived and referring to this task by URL. !!(https://gerrit.wikimedia.org/r/526682 waiting for review)!!
-- [x] Mark the repository read-only in Gerrit (Edit description to prepend "[ARCHIVED]" and append Task reference): https://gerrit.wikimedia.org/r/admin/projects/mediawiki/extensions/SemanticTitle
-- [x] Archive the diffusion repository for the extension/skin: https://phabricator.wikimedia.org/diffusion/ESTI/
-- [x] Delete the GitHub mirror: https://github.com/wikimedia/mediawiki-extensions-SemanticTitle