Information Systems Group

― Knowledge Representation and Reasoning

Giorgio Stefanoni

Research Student


I studied applied computer science at the Free University of Bozen-Bolzano. Under the supervision of Prof. Werner Nutt and Dr Maria Keet, I graduated with first class honours (110 cum laude) in 2009. In my thesis project, I designed and implemented a prototypical web interface for visually querying ontology-enriched biological databases through ontologies over a Web interface. After my Bachelor, I attended the European Master in Computational Logic. In the first year of the program, I studied at the Free University of Bozen-Bolzano and, under the supervision of Prof. Diego Calvanese, I started a project on explaining query answers in the Description Logic DL-Lite. In the second year of the program, I continued working on this project in Vienna at the Technische Universitaet Wien under the joint-supervision of Dr. Magdalena Ortiz, Dr. Mantas Simkus, and Prof. Thomas Eiter. In August 2011, I graduated with first class honours.

Currently, I am a doctoral student at the Department of Computer Science, University of Oxford. I am a member of the Knowledge Representation Group and, under the joint-supervision of Dr. Boris Motik and Prof. Ian Horrocks, I am working on query answering in the EL profile of OWL2.

Recent Publications

Introducing Nominals to the Combined Query Answering Approaches for EL. Giorgio Stefanoni‚ Boris Motik and Ian Horrocks. In AAAI 2013. To appear.

Reasoning about Explanations for Negative Query Answers in DL-Lite. Diego Calvanese, Magdalena Ortiz, Mantas Simkus, and Giorgio Stefanoni. J. of Artificial Intelligence Research. 2013. To appear.

Small Datalog Query Rewritings for EL. Giorgio Stefanoni‚ Boris Motik and Ian Horrocks. In Description Logics. 2012.

The Complexity of Explaining Negative Query Answers in DL−Lite. Diego Calvanese‚ Magdalena Ortiz‚ Mantas Simkus and Giorgio Stefanoni. Proc. of the 13th Int. Conf. on the Principles of Knowledge Representation and Reasoning (KR 2012).

The Complexity of Conjunctive Query Abduction in DL−Lite. Diego Calvanese‚ Magdalena Ortiz‚ Mantas Simkus and Giorgio Stefanoni In Description Logics. 2011.


Giorgio Stefanoni


Research Student

Contact Information

Wolfson Building, Parks Road, Oxford OX1 3QD


Awards at the ORE 2013 workshop

MORe, HermiT and ELK, three OWL reasoning systems developed in the Knowledge Representation and Reasoning (KRR) group, have been awarded at the OWL Reasoner Evaluation Workshop (ORE 2013).

OWL Reasoner Evaluation Workshop (ORE 2013)

The KRR group co-organises the 2nd edition of the OWL Reasoner Evaluation Workshop (ORE), collocated with DL 2013 workshop.

Best paper prize at SWAT4LS'12

Doctoral Student Despoina Magka's paper entitled 'Ontology-Based Classification of Molecules: a Logic Programming Approach' has received the best paper prize at the 2012 Semantic Web Applications and Tools for Life Sciences workshop [more information].

Boris Motik awarded EPSRC Early Career Fellowship

Boris Motik was recently successful in gaining an EPSRC Early Career Fellowship. The 5 year project, MaSI3: A Massively Scalable Intelligent Information Infrastructure, focuses on Ontology-based Data Management Systems (ODMSs). These are a new kind of data management system specifically designed to deal with complex data, by using natural language queries often across multiple relevant sources [more information].

KRR member wins 'doctoral award' from University of Manchester

Yavor Nenov's PhD thesis "Computability of Euclidean Spatial Logics" has been awarded the Best Thesis Prize of the School of Computer Science at the University of Manchester [more information].

Ian Horrocks (KRR group leader) elected to Academia Europaea

Ian Horrocks has been elected to join Academia Europæa, an eminent organization for European scholars. Academia Europæa was founded in 1988 and has over 2000 members, including around 40 Nobel Laureates [more information].

KRR member wins 'doctoral award' from Spanish university

The Jaume I University of Castellon (Spain) has awarded a "Premio extraordinario de doctorado" (roughly translated as a Extraordinary Doctoral Award) to Ernesto Jimenez-Ruiz who is now a postdoctoral researcher at Oxford's Department of Computer Science [more information].

OAEI 2012: Matching Large Biomedical Ontologies

The KRR group organises the Large Biomedical Ontologies track within the Ontology Alignment Evaluation Initiative.