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10th International Workshop on Scalable Semantic Web Knowledge Base Systems (SSWS 2014)

At the 13th International Semantic Web Conference (ISWC2014), Riva

del Garda, Italy October, 2014

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SSWS 2014 PC Co-chairs’ Message

SSWS 2014 is the tenth 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 re- quirements for these systems. First, they have to satisfy the applications semantic requirements by providing sufficient 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 addi- tional 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 9 submissions. Each paper was carefully evaluated by three workshop Program Committee members. Based on these reviews, we accepted 5 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 2014 Thorsten Liebig

Achille Fokoue

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Program Committee

Mihaela Bornea

IBM Watson Research Center, USA Oscar Corcho

Univ. Politecnica de Madrid, Spain Mike Dean

Raytheon BBN Technologies, USA Achille Fokoue

IBM Watson Research Center, USA Jhonatan Garcia

University of Aberdeen, UK Ra´ul Garc´ıa-Castro

Univ. Politecnica de Madrid, Spain Volker Haarslev

Condordia University, Canada Anastasios Kementsietsidis

Google Research, Mountain View, USA Pavel Klinov

Ulm University, Germany

Adila A. Krisnadhi

Wright State University, Ohio, USA Thorsten Liebig

derivo GmbH, Germany Ralf M¨oller

Hamburg Univ. of Techn., Germany Raghava Mutharaju

Wright State University, Ohio, USA Je↵Z. Pan

University of Aberdeen, UK Padmashree Ravindra

North Carolina State University, USA Mariano Rodriguez-Muro

IBM Watson Research Center, USA Pierpaolo Tommasi

IBM Research, Dublin, Ireland Takahira Yamaguchi

Keio University, Japan

Additional Reviewers

Yuan Ren

University of Aberdeen, UK

Jelena Vlasenko

Free University of Bozen-Bolzano, Italy

III

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Table of Contents

Invited Talk: RDFox A Modern Materialisation-Based RDF System . . . 1 Boris Motik

The NPD Benchmark for OBDA Systems . . . 3 Davide Lanti, Martin Rezk, Mindaugas Slusnys, Guohui Xiao and Diego Calvanese

Scheduling for SPARQL Endpoints. . . 19 Fadi Maali, Islam A. Hassan and Stefan Decker

Querying Distributed RDF Graphs: The E↵ects of Partitioning . . . 29 Anthony Potter, Boris Motik and Ian Horrocks

A Distributed Query Execution Method for RDF Storage Managers . . . 45 Kiyoshi Nitta and Iztok Savnik

Distributed OWL EL Reasoning: The Story So Far. . . 61 Raghava Mutharaju, Pascal Hitzler, Prabhaker Mateti

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