| Vol-423 Copyright © 2008 for the individual papers by the papers' authors. Copying permitted for private and academic purposes. Re-publication of material from this volume requires permission by the copyright owners.

# URSW '08
Uncertainty Reasoning for the Semantic Web - Volume 4

### Proceedings of the Fourth International Workshop on
Uncertainty Reasoning for the Semantic Web
Karlsruhe, Germany, October 26, 2008

Edited by

### Fernando Bobillo 1)
Paulo C. G. da Costa 2)
Claudia D'Amato 3)
Nicola Fanizzi 3)
Kathryn B. Laskey 2)
Kenneth J. Laskey 4)
Thomas Lukasiewicz 5)
Trevor Martin 6)
Matthias Nickles 7)
Michael Pool 8)
Pavel Smrž 9)

1) Universidad de Zaragoza, Departamento de Informática e Ingenieria de Sistemas, Zaragoza, Spain
2) George Mason University, Volgenau School of Information Technology and Engineering, Fairfax, VA, USA
3) Università degli Studi di Bari, Dipartimento di Informatica, Bari, Italy
4) MITRE Corporation, McLean, VA, USA
5) University of Oxford, Computing Laboratory, Oxford, UK
6) University of Bristol, Department of Engineering Mathematics, Bristol, UK
7) University of Bath, Department of Computer Science, Bath, UK
8) Convera, Inc., Vienna, VA, USA
9) Brno University of Technology, Department of Computer Graphics and Multimedia, Brno, Czech Republic

URSW'08 was held in conjunction with the 7th International Semantic Web Conference (ISWC2008).

## Table of Contents

> ### Foreword

### Technical Papers

1. Deciding Fuzzy Description Logics by Type Elimination
   Uwe Keller and Stijn Heymans
2. DeLorean: A Reasoner for Fuzzy OWL 1.1
   Fernando Bobillo, Miguel Delgado, and Juan Gómez-Romero
3. Describing and Communicating Uncertainty within the Semantic Web
   Matthew Williams, Lucy Bastin, Dan Cornford, and Ben Ingram
4. DL-Media: An Ontology Mediated Multimedia Information Retrieval System
   Umberto Straccia and Giulio Visco
5. Inference in Probabilistic Ontologies with Attributive Concept Descriptions and Nominals
   Rodrigo Bellizia Polastro and Fabio Gagliardi Cozman
6. Introducing Fuzzy Trust for Managing Belief Conflict over Semantic Web Data
   Miklos Nagy, Maria Vargas-Vera, and Enrico Motta
7. Representing Uncertain Concepts in Rough Description Logics via Contextual Indiscernibility Relations
   Nicola Fanizzi, Claudia d'Amato, Floriana Esposito, and Thomas Lukasiewicz
8. Storing and Querying Fuzzy Knowledge in the Semantic Web
   Nick Simou, Giorgos Stoilos, Vassilis Tzouvaras, Giorgos Stamou, and Stefanos Kollias
9. Uncertainty Treatment in the Rule Interchange Format: From Encoding to Extension
   Jidi Zhao and Harold Boley
10. Uncertainty Reasoning for the World Wide Web: Report on the URW3-XG Incubator Group
    Kenneth J. Laskey and Kathryn B. Laskey

### Position Papers

1. A Reasoner for Generalized Bayesian DL-Programs
   Livia Predoiu
2. Discussion on Uncertainty Ontology for Annotation and Reasoning
   Jan Dedek, Alan Eckhardt, Leo Galambos, and Peter Vojtáš
3. Maximum Entropy in Support of Semantically Annotated Datasets
   Paulo Pinheiro da Silva, Vladik Kreinovich, and Christian Servin
4. Relaxing the Basic KR&R Principles to Meet the Emergent Semantic Web!
   Vít Nováček
5. Tractable Reasoning Based on the Fuzzy EL++ Algorithm
   Theofilos Mailis, Giorgos Stoilos, Nick Simou, and Giorgos Stamou
6. Which Role for an Ontology of Uncertainty?
   Paolo Ceravolo, Ernesto Damiani, and Marcello Leida

The printed version of the URSW2008 workshop can be downloaded from this link.

04-Dec-2008: submitted by Thomas Lukasiewicz
05-Dec-2008: published on CEUR-WS.org