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ONCOR: Ontology- and Evidence-based Context Reasoner

Contact Person

Judy Kay
Judy Kay -

Judy aims to create personalised computing that is embedded throughout the environment to support people in the broad range of activities that are important to their lives.

Project Description

ONCOR (Ontology- and Evidence-based Context Reasoner) is a reasoning component that integrates ontological reasoning into the accretion-resolution (A/R) approach. With the A/R approach ONCOR is able to take a diverse list of contextual sources across different context models in the resolution, or reasoning process. At the heart of ONCOR is an extended Middle Building Ontology (MIBO)—an upper/middle ontology for modelling the inside of a building. We explore the potential of an ontology in the areas of conflict resolution, personalisation and privacy management in Ubiquitous Computing environments.

ONCOR has been integrated into the working prototype of Locator as a location conflict resolution component. The extended-MIBO used for reasoning is a location ontology for the School of Information Technologies building on the University of Sydney campus. It is semi-automatically built by parsing the building maps in SVG/XML formats. The resulting ontology is in the OWL-Lite format with 573 location instances.

The Middle Building Ontology (MIBO) is available in OWL-Lite here (9.5Kb). An extended-MIBO for the School of Information Technologies building is also available in OWL-Lite here (122Kb).

Related Publications


Niu, William T; Kay, Judy

PERSONAF: Framework for Personalised Ontological Reasoning in Pervasive Computing Journal Article

User modeling and User-Adapted Interaction: the Journal of Personalization Research, 20 (1), pp. 1-40, 2010.

Links | BibTeX


Niu, William; Kay, Judy

Location Conflict Resolution with an Ontology Inproceedings

Proceedings of Pervasive 2008: 6th International Conference on Pervasive Computing, pp. 162-179, 2008.


Niu, W; Kay, J

Personalised Pervasive Modelling with a Personalised Context Ontology Inproceedings

Berkovsky, Shlomo; Carmagnola, Francesca; Heckmann, Dominikus; Krueger, Antonio ; Kuflik, Tsvi (Ed.): Proceedings of UMI, User Model Integration, Workshop at AH 2008, pp. 38-42, Hannover, Germany, 2008.


Niu, William; Kay, Judy

Pervasive Personalisation of Location Information: Personalised Context Ontology Inproceedings

AH: International Conference on Adaptive Hypermedia and Adaptive Web-Based Systems, pp. 143-152, 2008.



Kay, Judy; Niu, William; Carmichael, David J

ONCOR: Ontology- and Evidence-based Context Reasoner Inproceedings

Proceedings of IUI 2007, 2th International Conference on Intelligent User Interfaces, pp. 290-293, ACM Press, Honolulu, Hawaii, USA, 2007.

Abstract | Links | BibTeX

Niu, William; Kay, Judy

Improving Location Reasoning with an Ontology Technical Report