Jeroen De Dauw

Jeroen De Dauw
Software Craftsman


Wikidata is a free knowledge base that can be read and edited by humans and machines alike. It centralizes storage and management of Wikipedias structured data and provides access to it in various open formats. It is powered by the Wikibase software, which is build on top of the MediaWiki platform and developed by Wikimedia Deutschland.

I was part of the original Wikidata team that started development of the software in 2012 and launched the website a year later. In 2019 I left Wikimedia Deutschland after being Software Architect there for 6 years. During these years I raked up over 6000 commits on the Wikibase software, nearly twice that of anyone else. You can find me in the contributors list on OpenHub.

My services

My company Professional Wiki provides fully managed Wikibase hosting. We can also help you with Wikibase support and custom Wikibase development.

Get in touch if you have any questions.

Wikibase libraries

I created several libraries part of the Wikibase software. These are used on websites such as Wikipedia and Wikidata and have received contributions from many other people.

Wikibase DataModel

The canonical PHP implementation of the Data Model at the heart of the Wikibase software.

Wikibase DataModel Serialization

Small library containing services to assist with serialization and deserialization of Wikibase DataModel objects.

Wikibase Internal Serialization

Services to assist with serialization and deserialization of Wikibase DataModel objects on the Wikimedia cluster.

Wikibase DataModel Services

A collection of services around Wikibase DataModel.

I also created these Wikibase related libraries:


Reading of, and iteration through, the Wikibase entities in a Wikibase Repository JSON dump.

Wikibase TermStore

Small library for looking up terms by item or property id or finding ids by term

QueryR EntityStore

Provides persistence and basic lookup capabilities for collections of Wikibase entities.

QueryR TermStore

Provides persistence of Wikibase terms with lookups of those terms and by those terms.


Note that the slides are generally not designed for after-talk usage. However, they are useful when watching the recording of a talk.

Wikibase: The Software behind Wikidata - slide preview

Abstract  •  Slides  •  Video  •  SMWCon Fall 2014

Blog posts