Prof. Dr. Markus Krötzsch

Professor Knowledge-Based Systems

markus.kroetzsch@tu-dresden.de
Secretary: secretary_wbs@mailbox.tu-dresden.de
Chat (Matrix ): @kroetzsc:tu-dresden.de
+49 351 463 38486
APB 3033
Consultation hour for students: Thu, 8:30 am – 9:30 am

Students who want to apply for a position at my group should first read this advice on applications.

I am professor for Knowledge-Based Systems at the Institute for Theoretical Computer Science of the Faculty of Computer Science at TU Dresden. My scientific interests are, broadly speaking, in the area of intelligent knowledge management systems, including the underlying mathematical foundations and related methods. 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.

Important applied projects that I have been involved with include:

The Nemo graph rule engine
Wikidata, the largest free knowledge graph of general knowledge.
Semantic MediaWiki (now a successful open source project with its own ecosystem)
The ELK ontology reasoner for OWL EL.

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, Markus Krötzsch, Maximilian Marx
SPARQLing Datalog for Rule-Based Reasoning over Large Knowledge Graphs (Extended Abstract)
In Marco Calautti, Matthias Lanzinger, eds., Proceedings of the 6th International Workshop on the Resurgence of Datalog in Academia and Industry (Datalog-2.0 2026), CEUR Workshop Proceedings, to appear. CEUR-WS.org
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Nils Küchenmeister, Alex Ivliev, Dörthe Arndt, Markus Krötzsch
Stratified Negation in RDF Rules: A Correct Approach
In Manolis Koubarakis, Maria-Esther Vidal, Axel Polleres, Marieke van Erp, Ernesto Jimenez Ruiz, Oshani Seneviratne, Lora Aroyo, Gianluca Demartini, Reham Alharbi, Roberto Barile, Claudia d'Amato, Valentina Tamma, eds., Proceedings of the 25th International Semantic Web Conference (ISWC 2026), to appear. Springer
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Julián Méndez, Lukas Gerlach, Tobias Wieland, Alex Ivliev, Markus Krötzsch, Raimund Dachselt
Evaluating a Visual Query Tracer and Builder for Learning Declarative Logic Programming
VIS 2026, to appear
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Alex Ivliev, Markus Krötzsch, Maximilian Marx
Recovering Explanations from Transformed Rule-Based Ontologies
In Manolis Koubarakis, Maria-Esther Vidal, Axel Polleres, Marieke van Erp, Ernesto Jimenez Ruiz, Oshani Seneviratne, Lora Aroyo, Gianluca Demartini, Reham Alharbi, Roberto Barile, Claudia d'Amato, And Valentina Tamma, eds., Proceedings of the 25th International Semantic Web Conference (ISWC 2026), to appear
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Alex Ivliev, Markus Krötzsch, Maximilian Marx
SPARQLing Datalog for Rule-Based Reasoning over Large Knowledge Graphs
In Maribel Acosta, Marieke van Erp, Sebastian Rudolph, Olaf Hartig, Blerina Spahiu, Anisa Rula, Daniel Garijo, Francesco Osborne, eds., Proceedings of the 23rd European Semantic Web Conference (ESWC 2026), Part I, volume 16549 of LNCS, 518-536, 2026. Springer
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Raimund Dachselt, Lukas Gerlach, Philipp Hanisch, Alex Ivliev, Markus Krötzsch, Maximilian Marx, Julián Méndez
Nemo at v0.10: Explainable Web Rule Reasoning for RDF, SPARQL, and More
In Maribel Acosta, Marieke van Erp, Sebastian Rudolph, Olaf Hartig, Blerina Spahiu, Anisa Rula, Daniel Garijo, Francesco Osborne, eds., Supplementary Proceedings of the 23rd European Semantic Web Conference (ESWC 2026), LNCS, to appear. Springer
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Raimund Dachselt, Lukas Gerlach, Philipp Hanisch, Alex Ivliev, Markus Krötzsch, Maximilian Marx, Julián Méndez
Declarative Debugging for Datalog with Aggregation
In Alexander Krause, João Felipe Pimentel, eds., Proceedings of the Workshops of the EDBT/ICDT 2026 Joint Conference (EDBT/ICDT-WS 2026), Tampere, Finland, March 24, 2026, volume 4192 of CEUR Workshop Proceedings, 2026. CEUR-WS.org
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Philipp Hanisch, Markus Krötzsch
Rule Rewriting Revisited: A Fresh Look at Static Filtering for Datalog and ASP
In Balder ten Cate, Maurice Funk, eds., Proceedings of the 29th International Conference on Database Theory, volume 365 of LIPIcs, 2026. Dagstuhl Publishing
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Nils Küchenmeister, Alex Ivliev, Markus Krötzsch
Towards Mass Spectrum Analysis with ASP
Theory and Practice of Logic Programming, February 2026
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Piotr Gorczyca, Dörthe Arndt, Martin Diller, Jochen Hampe, Georg Heidenreich, Pascal Kettmann, Markus Krötzsch, Stephan Mennicke, Sebastian Rudolph, Hannes Straß
Supporting Risk Management for Medical Devices via the Riskman Ontology and Shapes
Proceedings of the 21st International Conference on Semantic Systems (SEMANTiCS 2025), 226 - 246, September 2025
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