International Semantic Web Conference


First International Workshop on Modular Ontologies


November 5, 2006
Athens, Georgia, USA

Workshop Description


Realizing the full potential of the Semantic web requires the large-scale adoption and use of ontology-based approaches to sharing of information and resources. Constructing large ontologies typically requires collaboration among multiple individuals or groups with expertise in specific areas, with each participant contributing only a part of the ontology. Therefore, instead of a single, centralized ontology, in most domains, there are multiple distributed ontologies covering parts of the domain. Because no single ontology can meet the needs of all users under every conceivable scenario, the ontology that meets the needs of a user or a group of users needs to be assembled from several independently developed ontology modules. Thus, in realistic applications, it is often desirable to logically integrate different ontologies, wholly or in part, into a single, reconciled ontology. Ideally, one would expect the individual ontologies to be developed as independently as possible from the rest, and the final reconciliation to be seamless and free from unexpected results. This would allow for the modular design of large ontologies and would facilitate knowledge reuse. Few ontology development tools, however, provide any support for integration, and there has been relatively little study of the problem at a fundamental level. In order for the full potential of the Semantic Web to be realized in practice, we need to come to terms with the characteristics of web ontologies. Specifically, next generation ontology languages and/or tools need to support collaborative construction, selective sharing and use of ontologies. In response to this need, there is a growing interest in, on the one hand, logical formalisms that support ontology modularization and the study of integration and segmentation problems on the other. Against this background, the proposed workshop aims to bring together researchers and practitioners to discuss the current state of the art and open research problems in ontology modularization and integration. A secondary goal of the workshop is to facilitate collaborations between different research groups.

Workshop Topics


  • Logical formalisms for modular ontologies: syntax, semantics, and expressivity
  • Sharing and reuse of ontology modules . linking and importing approaches
  • Collaboratively developing and sharing of ontologies and inter-ontology mappings
  • Identification and analysis of common scenarios for ontology integration or modularization
  • Methodologies for providing semantic guarantees on merged ontologies
  • Methodologies for extracting semantically meaningful modules from large ontologies
  • Selective information sharing between ontology modules
  • Features and limitations of DDLs, E-connections, and P-DLs
  • Requirements of modular ontology languages
  • Reconciling inconsistent ontology modules
  • Approaches to distributed reasoning and their soundness, completeness, efficiency
  • Extensions to ontology languages to support modularity
  • Modular ontology tools for collaborative ontology development
  • Case studies, software tools, use cases, and application
  • Open problems

Workshop Format


The workshop will consist of:
  • An opening session for introducing the workshop topics, goals, participants, and expected outcomes
  • A small number of invited talks carefully intermixed with presentation of contributed papers. The invited talks will give overviews of the main modular ontology language proposals, and of logical approaches to ontology modularization/integration.
  • Breaks between sessions, meant to encourage informal discussions related to the topics discussed in the sessions and to create opportunities for collaborations.
  • Discussion of open problems and future research directions
  • A wrap-up session summarizing the workshop (including formal or informal discussions).

Paper Submissions


We invite papers that report on completed or work in progress on relevant topic areas. All papers will be peer-reviewed by members of the WoMO-2006 program committee. The contributions should be prepared in PDF format according to the formatting guidelines for Springer-Verlag (LNCS). Submissions should be limited to a maximum of 6 pages for short papers, and 14 pages for full papers Submissions in PDF form should be made through the WoMO 2006 Submissions Site.

Extended versions of selected papers may be published in a special issue of a journal or an edited book.

Important Dates


Submissions Due: August 3, 2006

Notification of Acceptance: August 31, 2006

Camera-ready versions due: September 15, 2006

Workshop: November 5, 2006

Accepted Papers


  • Jie Bao and Vasant Honavar. An Analysis of Modular Ontology Language Proposals for a Divide and Conquer Approach to the Semantic Web
  • Mathieu d'Aquin, Marta Sabou and Enrico Motta. Modularization: a Key for the Dynamic Selection of Relevant Knowledge Components
  • Chiara Ghidini and Luciano Serafini. Mapping properties of heterogeneous ontologies
  • Frank Loebe. Requirements for Logical Modules
  • Klaus Luttich, Claudio Masolo and Stefano Borgo. Development of Modular Ontologies in CASL
  • Jeff Pan, Luciano Serafini and Yuting Zhao. Semantic Import: An Approach for Partial Ontology Reuse
  • Anne Schlicht and Heiner Stuckenschmidt. Towards Structural Criteria for Ontology Modularization
  • Heiner Stuckenschmidt. Implementing Modular Ontologies with Distributed Description Logics



Peter Haase, Institute AIFB, Universitat Karlsruhe,

Vasant Honavar, Department of Computer Science, Iowa State University,

Oliver Kutz, School of Computer Science, The University of Manchester,

York Sure, Institut AIFB, Universitat Karlsruhe,

Andrei Tamilin, University of Trento,

Workshop Schedule

Program Committee


Jie Bao, Iowa State University, USA

Oscar Corcho, University of Manchester, UK

Bernardo Cuenca-Grau, University of Manchester, UK

Claudia Diamantini, Universita Politecnica delle Marche, Italy

Martin Dzbor, Open University, UK

Chiara Ghidini, ITC-irst, Italy

Silvio Ghilardi, Universita degli Studi di Milano, Italy

Pascal Hitzler, University of Karlsruhe, Germany

Lalana Kagal, MIT, USA

Alexander Löser, IBM, USA.

Carsten Lutz, Dresden University of Technology, Germany

Natasha Noy, Stanford University, USA

Alan Rector, University of Manchester, UK

Luciano Serafini, ITC-irst, Italy

Michael Sintek, DFKI Kaiserslautern, Germany

Heiner Stuckenschmidt, University of Mannheim, Germany

Holger Wache, Vrije Universiteit Amsterdam, Netherlands

Krzysztof Wecel, Poznan University of Economics, Poland

Frank Wolter, University of Liverpool, UK

Michael Zakharyaschev, Birbeck College, UK

Lei Zhang, IBM China Research Lab, China