The Ontologies of Linguistic Annotations (OLiA) provide an OWL/DL taxonomy of data categories as a reference for linguistic annotation (OLiA Reference Model), plus OWL/DL models for a large number of annotation schemes (OLiA Annotation Models) and their relationship to reference data categories (OLiA Linking Models). The OLiA Reference Model itself is linked to community-maintained repositories such as GOLD (http://linguistics-ontology.org/) and ISOcat (http://www.isocat.org).

The OLiA ontologies were originally developed in the context of an infrastructure for the sustainable maintenance of linguistic resources, and they have been applied for the formalization of annotation schemes, concept-based querying over heterogeneously annotated corpora, the development of interoperable NLP pipelines, and as a central hub for annotation terminology in the Linguistic Linked Open Data (LLOD) cloud.

From 2005-2011, the OLiA ontologies were hosted at the University of Potsdam, Germany, 2012-2019 at SourceForge, and since 2019 at Github. Please do not directly refer to any of these repositories nor any other mirror, but use (and consult) links under http://purl.org/olia, instead.

OLiA has been designed as an open source resource and has always been released as such. The SourceForge edition (until 2019) used CC-BY-SA 3.0. For up-to-date licensing information and the necessary attribution, please see http://purl.org/olia/Readme.md.

Brought to you by the Applied Computational Linguistics lab at Goethe University Frankfurt, Germany.

OLiA is open source (code: Apache v.2, data: CC-BY 3.0), for terms of use, attribution and detailed documentation, please see the official website.