Muhammad Saleem Aidan Hogan Ricardo Usbeck Ruben Verborgh Axel-Cyrille Ngonga Ngomo (Eds.) Proceedings of QuWeDa 2019: 3rd Workshop on Querying and Benchmarking the Web of Data co-located with 18th International Semantic Web Conference (ISWC 2019) Auckland, New Zealand, October 26-30, 2019 ©2019 for the individual papers by the papers’ authors, unless indicated otherwise. Copying permitted for private and academic purposes. Re-publication of material from this volume requires permission by the copyright owners, unless indicated otherwise. Primary Editors’ address: University of Leipzig Augustusplatz 10 04109 Leipzig, Germany saleem@informatik.uni-leipzig.de Preface The constant growth of Linked Open Data (LOD) on the Web opens new challenges pertaining to querying such massive amounts of publicly available data. LOD datasets are available through various interfaces, such as data dumps, SPARQL endpoints, and triple pattern fragments. In addition, various sources produce streaming data. Efficiently querying these sources is of central importance for the scalability of Linked Data and Semantic Web technologies. The trend of publicly available and interconnected data is shifting the focus of Web technologies towards new paradigms of Linked Data querying. To exploit the massive amount of LOD data to its full potential, users should be able to query and combine this data easily and effectively. This workshop at the International Semantic Web Conference (ISWC) presented original articles describing theoretical and practical methods and techniques for fostering, querying and consuming the Data Web. The workshop brought together members of the community interested in demonstrating their latest advances in query processing systems for RDF. The event fostered discussion for proposing novel RDF query processing techniques, language extension, and benchmarking and experimental evaluation of the engines. We thank the authors for their submissions and the program committee for their hard work. November 2019 Muhammad Saleem, Aidan Hogan, Ricardo Usbeck, Ruben Verborgh, Axel-Cyrille Ngonga Ngomo QuWeDa 2019 Organizing Committee Muhammad Saleem, Universit¨at Leipzig Aidan Hogan, Universidad de Chile, Ricardo Usbeck, Universit¨at Paderborn Ruben Verborgh, Ghent University Axel-Cyrille Ngonga Ngomo, Universit¨at Paderborn QuWeDa 2019 Program Committee Stasinos Konstantopoulos, NCSR Demokritos 3 Maribel Acosta, Karlsruhe Institute of Technology Pascal Molli, University of Nantes - LS2N Peter Haase, metaphacts Andreas Schwarte, Veritas Deutschland GmbH Gong Cheng, Nanjing University Andriy Nikolov, metaphacts GmbH Danh Le Phuoc, TU Berlin Oscar Corcho, Universidad Politecnica de Madrid Hala Skaf-Molli, Nantes University Stefan Schlobach, Vrije Universiteit Amsterdam Valeria Fionda, University of Calabria Jurgen Umbrich, Vienna University of Economy and Business (WU) Olivier Corby, INRIA Edgard Marx, HTWK, Leipzig, Germany Tommaso Soru, University of Leipzig Joachim Van Herwegen, MMLab - UGent - iMinds Ghislain Auguste Atemezing, Mondeca Geraldo Sousa, Paderborn University Timofey Ermilov, University of Leipzig Stefan Dietze, GESIS - Leibniz Institute for the Social Sciences Harald Sack, FIZ Karlsruhe, Leibniz Institute for Information Infrastructure & KIT Karlsruhe Giuseppe Pirrò, Sapienza University of Rome Luis Ibanez-Gonzalez, University of Southampton Enrico Daga, The Open University Olaf Hartig, Linköping University AndreValdestilhas, AKSW Maria Esther Vidal, Universidad Simon Bolivar, Dept. Computer Science SörenAuer, TIB Leibniz Information Center Science & Technology and University of Hannover Adrian Wilke, DICE University of Paderborn Ibrahim Abdelaziz, IBM research Alexander Bigerl, DICE University of Paderborn Felix Conrads, DICE University of Paderborn