Markus Krötzsch

From International Center for Computational Logic

Prof. Dr. Markus Krötzsch

ProfessorTechnische Universität DresdenInternational Center for Computational Logic Knowledge-Based Systems

I am professor for Knowledge-Based Systems at the Institute for Theoretical Computer Science of the Faculty of Computer Science at TU Dresden. The professorship is also part of TUD's Center for Advancing Electronics. My scientific interests are, broadly speaking, in the area of intelligent knowledge management systems. I have made contributions to lightweight and rule-based ontology languages, query answering, reasoning complexity, and content management and integration platforms for the Web of Data. This has led to many publications, but also to introductory texts (including two textbooks) and other teaching materials. I also co-edited the W3C Web Ontology Language standard OWL 2.

My most important applied work at the moment is Wikidata. Other projects I have contributed to include the semantic content management system Semantic MediaWiki and the highly efficient ELK ontology reasoner. Behind each of these projects are a number of truly outstanding people with whom I have had (and still have) the pleasure to work.

Newest Publications

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Alex Ivliev, Stefan Ellmauthaler, Lukas Gerlach, Maximilian Marx, Matthias Meißner, Simon Meusel, Markus Krötzsch
Nemo: First Glimpse of a New Rule Engine
Proceedings 39th International Conference on Logic Programming, Electronic Proceedings in Theoretical Computer Science, to appear
Larry Gonzalez, Alex Ivliev, Stephan Mennicke, Markus Krötzsch
Efficient Dependency Analysis for Existential Rules
In Benny Kimelfeld, Maria Vanina Martinez, Renzo Angles, eds., Proceedings of the 15th Alberto Meldenzon International Workshop on Foundations of Data Management (AMW'23). Santiago, Chile, volume 3409 of CEUR Workshop Proceedings, 2023.
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Stefan Ellmauthaler, Markus Krötzsch, Stephan Mennicke
Answering Queries with Negation over Existential Rules
Proceedings of the 36th AAAI Conference on Artificial Intelligence (AAAI 2022), 5626-5633, 2022. AAAI Press
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Stefan Borgwardt, Jörg Hoffmann, Alisa Kovtunova, Markus Krötzsch, Bernhard Nebel, Marcel Steinmetz
Expressivity of Planning with Horn Description Logic Ontologies (Extended Abstract)
In Ofer Arieli, Martin Homola,Jean Christoph Jung, Marie-Laure Mugnier, eds., Proceedings of the 35th International Workshop on Description Logics (DL 2022), volume 3263 of CEUR Workshop Proceedings, 2022.
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Stefan Borgwardt, Jörg Hoffmann, Alisa Kovtunova, Markus Krötzsch, Bernhard Nebel, Marcel Steinmetz
Expressivity of Planning with Horn Description Logic Ontologies
Proceedings of the 36th AAAI Conference on Artificial Intelligence (AAAI 2022), 5503--5511, 2022. AAAI Press
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Jacopo Urbani, Markus Krötzsch, Thomas Eiter
Chasing Streams with Existential Rules
In Gabriele Kern-Isberner, Gerhard Lakemeyer, Thomas Meyer, eds., Proceedings of the 19th International Conference on Principles of Knowledge Representation and Reasoning (KR 2022), 2022
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Raven Beutner, David Carral, Bernd Finkbeiner, Jana Hofmann, Markus Krötzsch
Deciding Hyperproperties Combined with Functional Specifications
In Christel Baier and Dana Fisman, eds., Proceedings of the 37th Annual ACM/IEEE Symposium on Logic in Computer Science (LICS 2022), 56:1--56:13, 2022. ACM
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Markus Krötzsch
Wissen als Code: Die Welt der Wissensgraphen und Ontologien
Linux-Magazin (12/2022):24-28, 2022
Markus Krötzsch
Data, Ontologies, Rules, and the Return of the Blank Node
Keynote at the 21st International Semantic Web Conference, 2022
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Larry González, Alex Ivliev, Markus Krötzsch, Stephan Mennicke
Efficient Dependency Analysis for Rule-Based Ontologies
In Ulrike Sattler, Aidan Hogan, Maria Keet, Valentina Presutti, João Paulo A. Almeida, Hideaki Takeda, Pierre Monnin, Giuseppe Pirrò, Claudia d’Amato, eds., The Semantic Web – ISWC 2022, volume 13489 of Lecture Notes in Computer Science, 267-283, October 2022. Springer
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Student projects

Completed Theses




Center for Perspicuous Computing

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Innovating Sales and Planning of Complex Industrial Products Exploiting Artificial Intelligence


AI Assisted Certification of Medical Software


School of Embedded Composite Artificial Intelligence


Center for Scalable Data Analytics and Artificial Intelligence

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Semantic MediaWiki
Popular open-source software for collaborative data management

A fast, highly scalable rule engine for existential rules and Datalog.


Wikipedia's free, collaborative knowledge base


Wikidata SPARQL Logs
Access logs from the Wikidata SPARQL Query Service