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ONKI Light

ONKI Light front page

ONKI Light is a SKOS vocabulary browser that can be used by content indexers and information seekers to search for vocabulary concepts and terms. It is built as a web application on top of a standard SPARQL endpoint. In addition to the web interface, it provides a REST API for machine access as well as RDF / Linked Data download access to individual concepts and whole vocabularies.

See the ONKI Light demonstration for a list of available vocabularies and to try out the user interface.

The ONKI Light software (PHP web application) including the source code and documentation (in the wiki) is available at the project page on Google Code.

The software is distributed under the MIT license.



Osma Suominen, Henri Ylikotila, Sini Pessala, Mikko Lappalainen, Matias Frosterus, Jouni Tuominen, Thomas Baker, Caterina Caracciolo and Armin Retterath: Publishing SKOS vocabularies with Skosmos. 2016. Technical Report. bib pdf


Osma Suominen, Sini Pessala, Jouni Tuominen, Mikko Lappalainen, Susanna Nykyri, Henri Ylikotila, Matias Frosterus and Eero Hyvönen: Deploying National Ontology Services: From ONKI to Finto. Proceedings of the Industry Track at the International Semantic Web Conference 2014, CEUR Workshop Proceedings, Riva del Garda, Italy, October, 2014. Vol 1383. bib pdf link
The Finnish Ontology Library Service ONKI was published as a living laboratory prototype for public use in 2008. Its idea is to support content indexers and ontology developers via a browser interface and machine APIs. ONKI has been well-accepted, but being a prototype maintained by the ending research project FinnONTO (2003–2012), a more sustainable service was needed, supported by permanent governmental funding. To achieve this, ONKI was deployed and is being further developed by the National Library of Finland into a new national vocabulary service Finto. We discuss challenges in the deployment of ONKI into Finto and lessons learned during the transition process.


Osma Suominen, Alex Johansson, Henri Ylikotila, Jouni Tuominen and Eero Hyvönen: Vocabulary Services Based on SPARQL Endpoints: ONKI Light on SPARQL. Poster proceedings of the 18th International Conference on Knowledge Engineering and Knowledge Management (EKAW 2012), Galway, Ireland, October, 2012. bib pdf

Contact Persons

Henri Ylikotila, Dr. Osma Suominen, Dr. Jouni Tuominen, Prof. Eero Hyvönen

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