Proceedings c 2013 for the individual papers by the papers’ authors. Copying permitted only for private and academic purposes. This volume is published and copyrighted by its editors. Re-publication of material from this volume requires permission by the copyright owners. OrdRing 2013 was the 2nd International Workshop on Ordering and Reasoning and was collocated with 12th International Semantic Web Conference (ISWC 2013) in Sydney. The OrdRing workshop series aims to stimulate a paradigm shift in semantic technologies toward novel methods that integrate ordering with reasoning inspired by stream and rankaware data management.
More and more applications require real-time processing of massive, dynamically generated, ordered data, where order is often an essential factor reflecting recency, proximity or relevance. Stream and rank-aware data management techniques are progressively providing reactive and reliable query answering over such massive datasets, allowing integration of highly dynamic sources. Key to their success is the use of streaming algorithms that harness the natural or enforceable orders in the data. The expressive power of semantic technologies is needed in those applications, yet existing semantic technologies are often unable to address these needs, since they do not consider ordering as an essential property. Ranking results is often seen as an added task, performed after inference, without affecting the inference process, which is order-agnostic.
The OrdRing workshops reflect a trend towards order-aware semantic technologies: both researchers and practitioners understand that order matters in reasoning over massive and highly dynamic data. The idea of Stream Reasoning is gaining considerable momentum. Some top-k query answering techniques for Linked Data appeared. Several works are considering SPARQL query answering on RDF annotated with partially ordered labels. The description logic community is investigating top-k ontological query answering. This year’s workshop received eight submissions out of which six were accepted. These submissions were equally distributed over two themes: extending the expressiveness of representation and query languages to better capture ordering information and reasoning over semantic data streams.
The increased interest in ordering and streaming information is also reflected by recent plans to start a W3C RDF Stream Processing Community Group. Given the close relation between the workshop topic and the discussion of the community group, the OrdRing workshop featured a keynote on this new group given by Oscar Corcho and was collocated with the open-door meeting of the group.
OrdRing 2013 featured excellent scientific papers, a high-profile keynote advocating the setting up of a community group for stream processing and a discussion of the future of the topic. We are happy and proud to present the proceedings of the workshop. October 2013
Irene Celino, Emanuele Della Valle
Markus Kro¨tzsch and Stefan Schlobach
Stefano Ceri – DEIB – Politecnico di Milano, IT Ian Horrocks – University of Oxford, UK Frank van Harmelen – Vrije Universiteit Amsterdam, NL
Irene Celino – CEFRIEL, Milano, IT Emanuele Della Valle – DEIB – Politecnico di Milano, IT Markus Kro¨ tzsch – University of Oxford, UK Stefan Schlobach – Vrije Universiteit Amsterdam, NL
Alessandro Bozzon – Delft University of Technology, NL David Carral – Wright State University, OH, USA Oscar Corcho – Universidad Polite´cnica de Madrid, Spain Peter Haase – fluid Operations, Walldorf, Germany Carsten Lutz – Universita¨t Bremen, Germany Jeff Z. Pan – University of Aberdeen, UK Axel Polleres – Siemens AG O¨ sterreich & WU (Wirtschaftsuniversita¨t Wien), Austria Sebastian Rudolph – Technische Universita¨t Dresden, Germany Steffen Staab – University of Koblenz-Landau, Germany Umberto Straccia – ISTI-CNR, Pisa, Italy Guido Vetere – IBM, Roma, Italy Haofen Wang – Shanghai Jiao Tong University, China Kewen Wang – Griffith University, Queensland, Australia Gerhard Weikum – Max-Planck Institute for Informatics, Saarbru¨ cken, Germany Zhe Wu – Oracle, CA, USA
Yuting Zhao – University of Aberdeen, UK
Oscar Corcho and Jean-Paul Calbimonte 1
Marina Gueroussova, Axel Polleres and Sheila McIlraith
Cliff Joslyn, Emilie Hogan, Patrick Paulson, Elena Peterson, Eric Stephan and Dennis Thomas
Albin Ahmeti and Axel Polleres
Robin Keskisa¨rkka¨ and Eva Blomqvist
Tu Ngoc Nguyen and Wolf Siberski 2-8 9-20 21-32 33-36 37-42 43-54