Picture of Olaf Hartig Olaf Hartig
Associate Professor (Universitetslektor, docent)
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).


December 21, 2021: It is done! We have published the final community group report of the RDF-star spec.

October 22, 2021: I will serve as Doctoral Consortium co-chair of the 21st International Semantic Web Conference (ISWC), which will take place in October 2022 in Hangzhou, China.

September 8, 2021: Best paper award!! Robin Keskisärkkä, Eva Blomqvist, and I have won the best paper award at the SEMANTiCS Conference 2021. The title of our paper is "Optimizing RDF Stream Processing for Uncertainty Management" (PDF file download a preprint).

September 6, 2021: I have been selected for the Amazon Scholars program! I am hugely excited about the opportunity to spend some of my time working with the AWS Neptune team to advance the state of the art in graph databases and graph database systems.

August 25, 2021: Our community vision "The Future Is Big Graphs: A Community View on Graph Processing Systems" has appeared in The Communications of the ACM. This vision paper is the result of a Dagstuhl seminar on "Big Graph Processing Systems".

June 2, 2021: New paper: With Robin Keskisärkkä and Eva Blomqvist (all Linköping University) we have a paper titled "Optimizing RDF Stream Processing for Uncertainty Management" at SEMANTiCS 2021. We have made available a PDF file preprint of this paper.

April 20, 2021: I have been interviewed by The Graph Show about RDF-star. Check out the recording of the interview.

April 13, 2021: We have published the second draft of the RDF-star spec.

March 30, 2021: I have been invited to present the RDF-star approach in the upcoming Knowledge Graph Conference.

March 26, 2021: Together with Pierre-Antoine Champin, we presented the RDF-star approach in a Lotico event. A recording of the presentation can be found on the event page.

December 1, 2020: Sijin and I have won the best paper award for our paper "FedQPL: A Language for Logical Query Plans over Heterogeneous Federations of RDF Data Sources" PDF file at the 22nd International Conference on Information Integration and Web-based Applications & Services (iiWAS)!!!


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