2012 -

At the 11th International Semantic Web Conference (ISWC2012), Boston, USA, November, 2012

SSWS + HPCSW 2012 PC Co-chairs’ Message For 2012, the 8th International Workshop on Scalable Semantic Web Knowledge Base Systems (SSWS2012) and the 2nd Workshop on High-Performance Computing for the Semantic Web (HPCSW2012) were merged together. This joint workshop focused on addressing broader 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 like 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 application’s 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 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 11 submissions. Each paper was carefully evaluated by three 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.

 November 2012 Achille Fokoue

Thorsten Liebig Eric Goodman

Jesse Weaver Jacopo Urbani David Mizell

Program Committee Jans Aasman Franz, Inc. Robert Adolf Pacific Northwest Nat. Lab., USA Sinan Al-Saffar Pacific Northwest Nat. Lab., USA Anastasios Kementsietsidis IBM Watson Research Center, USA Pavel Klinov Ulm University, Germany Spyros Kotoulas

IBM Watson Research Center, USA Alexey Cheptsov Thorsten Liebig High Performance Computing Center derivo GmbH, Germany Stgt, Germany

 Oscar Corcho Univ. Politecnica de Madrid, Spain Mike Dean BBN Technologies, USA Achille Fokoue IBM Watson Research Center, USA Rau´l Garc´ıa-Castro Univ. Politecnica de Madrid, Spain Eric Goodman Sandia National Laboratories, USA Yuanbo Guo Microsoft, USA Volker Haarslev Condordia University, Canada David Haglin Pacific Northwest Nat. Lab., USA Pascal Hitzler Wright State University, Ohio, USA Aidan Hogan DERI Galway, Ireland Bill Howe University of Washington, USA Cliff Joslyn Pacific Northwest Nat. Lab., USA David Mizell YarcData, Inc, USA Ralf M¨oller Hamburg Univ. of Techn., Germany Jeff Z. Pan University of Aberdeen, UK Axel Polleres

Siemens AG, O¨ sterreich

 Mariano Rodriguez Free University of Bolzano, Italy Sebastian Rudolph Karlsruhe Inst. of Techn., Germany Andy Seaborne Epimorphics, UK Kavitha Srinivas IBM Watson Research Center, USA Jacopo Urbani Vrije Universiteit Amsterdam, Netherlands Jesse Weaver Rensselaer Polytechnic Institute, USA Gregory Todd Williams Rensselaer Polytechnic Institute, USA Takahira Yamaguchi Keio University, Japan Additional Reviewers Cong Wang Wright State University, Ohio, USA Kevin Lee University of Aberdeen, UK

1 Scalable Nonmonotonic Reasoning over RDF data using MapReduce . . . .

Ilias Tachmazidis, Grigoris Antoniou, Giorgos Flouris and Spyros Kotoulas