9th International Workshop on Scalable Semantic Web Knowledge Base Systems (SSWS 2013)

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SSWS 2013 PC Co-chairs' Message SSWS 2013 is the ninth edition of the successful Scalable Semantic Web Knowledge Base Systems workshop series. The workshop series is focussed on addressing scalability issues with respect to the development and deployment of knowledge base systems on the Semantic Web. Typically, such systems deal with information described in Semantic Web languages such as OWL and RDF(S), and provide services such as storing, reasoning, querying and debugging. There are two basic requirements for these systems. First, they have to satisfy the applications semantic requirements by providing su cient reasoning support. Second, they must scale well in order to be of practical use. Given the sheer size and distributed nature of the Semantic Web, these requirements impose additional challenges beyond those addressed by earlier knowledge base systems. This workshop brought together researchers and practitioners to share their ideas regarding building and evaluating scalable knowledge base systems for the Semantic Web.

This year we received 10 submissions. Each paper was carefully evaluated by four workshop Program Committee members. Based on these reviews, we accepted seven papers for presentation. We sincerely thank the authors for all the submissions and are grateful for the excellent work by the Program Committee members.

October 2013

Thorsten Liebig Achille Fokoue

Program Committee

Mihaela Bornea IBM Watson Research Center, USA

Oscar Corcho Univ. Politecnica de Madrid, Spain

Achille Fokoue IBM Watson Research Center, USA

Raul Garc a-Castro Univ. Politecnica de Madrid, Spain

Volker Haarslev Condordia University, Canada

Pascal Hitzler Wright State University, Ohio, USA

Anastasios Kementsietsidis IBM Watson Research Center, USA

Pavel Klinov Ulm University, Germany

Spyros Kotoulas IBM Watson Research Center, USA

Additional Reviewers

Norman Heino Leipzig University, Germany

Amit Joshi Wright State University, Ohio, USA

Raghava Mutharaju Wright State University, Ohio, USA

Andrea Reale University of Bologna, Italy

Adila A. Krisnadhi Wright State University, Ohio, USA

Thorsten Liebig derivo GmbH, Germany

Ralf Moller Hamburg Univ. of Techn., Germany Je Z. Pan University of Aberdeen, UK

Bijan Parsia University of Manchester, UK

Padmashree Ravindra North Carolina State University, USA

Mariano Rodriguez Free University of Bolzano, Italy

Sebastian Rudolph Karlsruhe Inst. of Techn., Germany

Takahira Yamaguchi Keio University, Japan

Yuan Ren University of Aberdeen, UK

Martin Rezk Free University of Bolzano, Italy

Kejia Wu Condordia University, Canada

Count Aggregation in Semantic Queries : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : Bogdan Kostov, Petr Kremen 1 DistEL: A Distributed EL+ Ontology Classi er : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : 17

Raghava Mutharaju, Pascal Hitzler, Prabhaker Mateti Rule-based Reasoning on Massively Parallel Hardware : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : 33

Martin Peters, Christopher Brink, Sabine Sachweh, Albert Zundorf TripleRush: A Fast and Scalable Triple Store : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : 50

Philip Stutz, Mihaela Verman, Lorenz Fischer, Abraham Bernstein Eviction Strategies for Semantic Flow Processing : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : 66

Minh Khoa Nguyen, Thomas Scharrenbach, Abraham Bernstein A Distributed Directory System : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : 97 Fausto Giunchiglia, Alethia Hume

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