Report from Dagstuhl Seminar 12171 Semantic Data Management Edited by Grigoris Antoniou 1 , Oscar Corcho 2 , Karl Aberer 3 , Elena Simperl 4 , and Rudi Studer 5 1 University of Huddersfield – Huddersfield, UK, g.antoniou@hud.ac.uk 2 Universidad Politécnica de Madrid – Madrid, ES, ocorcho@fi.upm.es 3 École Polytechnique Fédérale de Lausanne – Lausanne, CH, karl.aberer@epfl.ch 4 Karlsruhe Institute of Technology – Karlsruhe, DE, elena.simperl@kit.edu 5 Karlsruhe Institute of Technology – Karlsruhe, DE, studer@kit.edu Abstract This report documents the program and the outcomes of Dagstuhl Seminar 12171 “Semantic Data Management”. The purpose of the seminar was to have a fruitful exchange of ideas between the semantic web, database systems and information retrieval communities, organised across four main themes: scalability, provenance, dynamicity and search. Relevant key questions cutting across all of these themes were: (i) how can existing DB and IR solutions be adapted to manage semantic data; and (ii) are there new challenges that arise for the DB and IR communities (i.e. are radically new techniques required)? The outcome was a deeper, more integrated understanding of the current state of the art on semantic data management and a the identification of a set of open challenges that will inform the three communities in this intersection. Seminar 22.–27. April, 2012 – www.dagstuhl.de/12171 1998 ACM Subject Classification H.2 Database Management, D.3.1 Formal Definitions and Theory Keywords and phrases Semantic data, Semantic Web, Linked Data, Large-scale data manage- ment, Dynamicity and stream processing, Provenance and access control, Information re- trieval and ranking Digital Object Identifier 10.4230/DagRep.2.4.39 1 Executive Summary Grigoris Antoniou Oscar Corcho Karl Aberer Elena Simperl Rudi Studer License Creative Commons BY-NC-ND 3.0 Unported license © Grigoris Antoniou, Oscar Corcho, Karl Aberer, Elena Simperl, Rudi Studer The Semantic Web represents the next generation World Wide Web, where information is published and interlinked in order to facilitate the exploitation of its structure and semantics (meaning) for both humans and machines. To foster the realization of the Semantic Web, the World Wide Web Consortium (W3C) developed a set of metadata (RDF), ontology languages (RDF Schema and OWL variants), and query languages (e.g., SPARQL). Research in the past years has been mostly concerned with the definition and implementation of Except where otherwise noted, content of this report is licensed under a Creative Commons BY-NC-ND 3.0 Unported license Semantic Data Management, Dagstuhl Reports, Vol. 2, Issue 4, pp. 39–65 Editors: Grigoris Antoniou, Oscar Corcho, Karl Aberer, Elena Simperl, and Rudi Studer Dagstuhl Reports Schloss Dagstuhl – Leibniz-Zentrum für Informatik, Dagstuhl Publishing, Germany