Java OmegaWiki Library

An application programming interface for the free thesaurus project OpenThesaurus. JOTL enables efficient and structured access to the information encoded OpenThesaurus, including synsets, senses, and semantic labels.

Publications and Citation Information

DKPro JOTL has been developed as part of the UBY project. You can read more about UBY in our scientific article:

Iryna Gurevych, Judith Eckle-Kohler, Silvana Hartmann, Michael Matuschek, Christian M. Meyer, and Christian Wirth: UBY – A Large-Scale Unified Lexical-Semantic Resource Based on LMF, in: Proceedings of the 13th Conference of the European Chapter of the Association for Computational Linguistics (EACL), p. 580–590, April 2012. Avignon, France. (download)

Please cite our EACL 2012 paper if you use the software in your scientific work.

License and Availability

The latest version of DKPro JOWKL is available via Maven Central. If you use Maven as your build tool, then you can add DKPro JOWKL as a dependency in your pom.xml file:


DKPro JOTL is available as open source software under the Apache License 2.0 (ASL). The software thus comes “as is” without any warranty (see license text for more details).


Prior to being available as open source software, DKPro JOWKL has been a research project at the Ubiquitous Knowledge Processing (UKP) Lab of the Technische Universität Darmstadt, Germany. The following people have mainly contributed to this project (in alphabetical order):

  • Yevgen Chebotar
  • Iryna Gurevych
  • Christian M. Meyer