Michael Grüninger. Ontology Repositories Make a World of Difference - (Abstract of Keynote Talk). In Leora Morgenstern, Petros S. Stefaneas, François Lévy, Adam Wyner, Adrian Paschke, editors, Theory, Practice, and Applications of Rules on the Web - 7th International Symposium, RuleML 2013, Seattle, WA, USA, July 11-13, 2013. Proceedings. Volume 8035 of Lecture Notes in Computer Science, pages 12, Springer, 2013. [doi]