The data model of a lexeme can be found here: https://www.mediawiki.org/wiki/Extension:WikibaseLexeme/Data_Model
Adding additional information that edit summaries will be aligned with Action API so in most cases it will be the same outcome as is in wbeditentities

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Status	Assigned	Task
Open	None	T428629 [Epic] REST API endpoints for lexemes
Duplicate	None	T428923 Read a full lexeme in the Wikibase REST API
Open	None	T428926 🐋 Create a lexeme in the Wikibase REST API
Resolved	Jakob_WMDE	T434082 🐋 Register POST /lexemes route handler and create use case
Resolved	Jakob_WMDE	T434432 🐋 Add POST /lexemes to the OpenAPI document
Resolved	Jakob_WMDE	T434433 🐋 Move statement deserializers and validators to the statements domain
Resolved	ItamarWMDE	T434434 🐋 Error if required elements are missing
Resolved	Jakob_WMDE	T434435 🐋 Implement LexemeCreator service
Resolved	ItamarWMDE	T434436 🐋 Validate lexeme lemmas
Resolved	ItamarWMDE	T434437 🐋 Validate lexeme language and lexical category
Resolved	Jakob_WMDE	T434438 🐋 Validate lexeme statements
Resolved	ItamarWMDE	T434439 🐋 Handle edit metadata when creating a new lexeme
Resolved	ItamarWMDE	T434440 🐋 Check user is authorized to create a lexeme
Open	Silvan_WMDE	T434441 🐋 Handle exceptions that can occur while saving the lexeme
Resolved	Silvan_WMDE	T436118 🐋 Handle ResourceTooLargeException while saving the lexeme
Open	kimpham	T436119 🐋 Handle EditPrevented while saving the lexeme
Resolved	ItamarWMDE	T436120 🐋 Handle RateLimitReached while saving the lexeme
Open	Silvan_WMDE	T436121 🐋 Handle EntityUpdateFailed while saving the lexeme
Resolved	Silvan_WMDE	T434442 🐋 Apply middlewares to CreateLexemeRouteHandler
Open	Jakob_WMDE	T434443 🐋 Add spec test for `POST /lexemes`
Resolved	Jakob_WMDE	T434528 🐋 Generate the expected edit summary when creating a new lexeme
Resolved	Jakob_WMDE	T434647 🐋 Add ETag and Last-Modified response headers
Open	Jakob_WMDE	T436939 🐋 Add Location header to 201 response pointing to the new lexeme
Resolved	Ifrahkhanyaree_WMDE	T429332 🦦 Retrieving a full lexeme (GET)
Resolved	Silvan_WMDE	T429333 Handle HTTP conditional request headers
Resolved	Jakob_WMDE	T429334 Handle user authentication/authorization
Resolved	Ifrahkhanyaree_WMDE	T429335 👓 Create OpenAPI documentation
Resolved	ItamarWMDE	T433336 👓 Extend the build:spec step to aggregate OpenAPI fragments from Wikibase extensions
Resolved	ItamarWMDE	T433337 👓 Create the WikibaseLexeme OpenAPI specification fragment
Resolved	ItamarWMDE	T433338 👓 Add end-to-end OpenAPI specification tests for WikibaseLexeme endpoints
Resolved	ItamarWMDE	T433593 👓 Make /v1/openapi.json reflect the extensions installed on the wiki
Resolved	Jakob_WMDE	T430942 🦦 Register GET /rest.php/wikibase/v0/entities/lexemes/{id}
Resolved	Silvan_WMDE	T430943 🦦 Enable lexeme dev routes on beta wikidata
Resolved	ItamarWMDE	T430944 🦦 Move needed statement models into a statements domain
Resolved	kimpham	T430945 🦦 Add lemmas field
Resolved	Silvan_WMDE	T430946 🦦 Add lexical_category and language field
Resolved	Jakob_WMDE	T430947 🦦 Add statements field
Resolved	kimpham	T430948 🦦 Add forms field
Resolved	ItamarWMDE	T430949 🦦 Add senses field
Resolved	Silvan_WMDE	T430950 🦦 Add ETag and Last-Modified response headers
Resolved	ItamarWMDE	T430951 🦦 Validate lexeme id path param
Resolved	Silvan_WMDE	T430952 🦦 Handle lexeme not found
Resolved	Jakob_WMDE	T430953 🦦 Handle lexeme redirects
Resolved	Jakob_WMDE	T430954 🦦 Handle unexpected exceptions
Resolved	Jakob_WMDE	T430955 🦦 Create RouteHandlersTest
Resolved	Ifrahkhanyaree_WMDE	T429572 🚧 Pre-work before building lexeme endpoints
Resolved	kimpham	T430037 🚧 Create WikibaseLexeme architecture tests
Resolved	kimpham	T430038 🚧 Set up api-testing for WikibaseLexeme
Resolved	Jakob_WMDE	T430039 🚧 Write ADR for Lexeme REST API

Event Timeline

Ifrahkhanyaree_WMDE created this task.Jun 9 2026, 3:07 PM

Restricted Application added a project: Epic. · View Herald TranscriptJun 9 2026, 3:07 PM

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Ifrahkhanyaree_WMDE updated the task description. (Show Details)Jun 10 2026, 8:34 AM

Ifrahkhanyaree_WMDE moved this task from Incoming tickets outside WPP to Backlog on the Wikibase Reuse Team board.

Ifrahkhanyaree_WMDE updated the task description. (Show Details)Jun 10 2026, 10:46 AM

@Arcstur and @Lydia_Pintscher wanted to bring y'alls attention to the epic and check whether this first set of endpoints would be enough as an MVP to be useful for the lexeme work.

Seems great!! We on QS3 use: create item (POST), create property (POST), modify full item (PATCH), modify full property (PATCH), and delete statement by id (DELETE)

So I believe having create lexeme, form, sense (POST) and modifying lexeme (PATCH) should be enough for us to have a good MVP.

It would be nice if the current endpoint of remove statement by ID accepts Lids and not only Qids as well, but I guess that's not necessary for a MVP.

Ifrahkhanyaree_WMDE added a subtask: T428923: Read a full lexeme in the Wikibase REST API.Jun 11 2026, 3:23 PM

Ifrahkhanyaree_WMDE created subtask T428926: 🐋 Create a lexeme in the Wikibase REST API.Jun 11 2026, 3:41 PM

Ifrahkhanyaree_WMDE moved this task from Next to Later on the Wikibase REST API (WPP) board.Jun 11 2026, 3:48 PM