Picture of Olaf Hartig Olaf Hartig

Senior Associate Professor (Biträdande professor)
Division for Database and Information Techniques
Department of Computer and Information Science (IDA)
Linköping University

Amazon Scholar
Neptune team at Amazon Web Services

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Research Interests

I am interested in problems related to the management of databases and knowledge. My focus in this broad context is on data on the Web (Semantic Web and Linked Data, in particular) and on graph data, as well as on problems in which the data is distributed over multiple, autonomous and/or heterogeneous sources (keywords: federated data management, federated knowledge graphs). Other keywords that appear in some of my work are data provenance and data quality. Regarding all of these topics, my interests range from theoretical foundations (e.g., complexity and expressive power of query languages) all the way to systems-building related research (e.g., efficient storage of datasets and databases, query processing, and query optimization).

News

February 25, 2025: Two new papers: Together with Sitt Min Oo, a PhD student at Ghent University in Belgium, we have a paper titled "An Algebraic Foundation for Knowledge Graph Construction" at ESWC 2025. We have made available the PDF file camera-ready version of this paper. Additionally, with Ali Elhalawati and Anastasia Dimou (both at KU Leuven, Belgium) and Daniel Hernández (University of Stuttgart, Germany) we have a paper with the title "Flexible RML-Based Mapping of Property Graphs to RDF" at the Transforming Graph Data Workshop (TGD) at EDBT/ICDT 2025. There is a PDF file camera-ready version of this paper as well.

February 21, 2025: I was recently interviewed about my research as a Wallenberg Academy Fellow. The resulting article has been published now: Swedish version and English version.

February 5, 2025: I will serve as Program Co-Chair of the 31st International Conference on Cooperative Information Systems (CoopIS), which will take place in October 2025 in Marbella, Spain.

August 12, 2024: New paper: With my PhD student Shahrzad Khayatbashi and colleague Amin Jalali (Stockholm University) we have a paper titled "Transforming Object-Centric Event Logs to Temporal Event Knowledge Graphs" at the OBJECTS workshop at BPM 2024. We have made available the PDF file camera-ready version of this paper.

May 30, 2024: We received the best poster award at the 21st Extended Semantic Web Conference (ESWC) for our work on "Datatypes for Lists and Maps in RDF Literals." The PDF file camera-ready version of the poster paper is available for download.

May 23, 2024: My first PhD student, Sijin Cheng, successfully defended her thesis!

April 22, 2024: Poster paper: With several of my colleagues of the Amazon Neptune team we have been working on a proposal to capture composite values (list and maps, in particular) as literals in RDF data. A poster paper about this proposal has been accepted for the 21st Extended Semantic Web Conference (ESWC) in May 2024. We have made available the PDF file camera-ready version of this paper, which has the title: "Datatypes for Lists and Maps in RDF Literals."

CV

Here is my academic CV: PDF file

Selected Publications

This following list contains selected publications. There is also a complete list of all my publications.

Get in Touch

EMail Address: email address

Office: Building B, Ground floor, Room 2B:478

Postal address: Dept. of Computer and Information Science (IDA), Linköpings universitet, SE-581 83 Linköping, SWEDEN