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

September 26, 2022: Our vision paper "The OneGraph Vision: Challenges of Breaking the Graph Model Lock-In" has been accepted by the Semantic Web Journal and will appear in 2023 in volume 14 of the journal. In the meantime, you can already read the PDF file camera-ready version of this paper.

September 13, 2022: I gave a keynote titled "Towards Querying Heterogeneous Federations of Interlinked Knowledge Graphs" at the 18th SEMANTiCS conference in Vienna. The PDF file slides are available for download.

August 12, 2022: New paper: With my PhD student Sijin Cheng we have a paper titled "LinGBM: A Performance Benchmark for Approaches to Build GraphQL Servers" at WISE 2022. We have made available the PDF file camera-ready version of this paper. Additionally, we have published PDF file a significantly extended version of the paper on arXiv and you may look at PDF file Github repo for LinGBM.

June 17, 2022: I have been promoted to Senior Associate Professor (biträdande professor)!!

June 3, 2022: I received a best reviewer award at ESWC 2022.

May 8, 2022: New paper: With my PhD student Shahrzad Khayatbashi and postdoc Sebastian Ferrada we have a paper titled "Converting Property Graphs to RDF: A Preliminary Study of the Practical Impact of Different Mappings" at GRADES 2022. We have made available a PDF file preprint of this paper.

April 24, 2022: I have been invited to serve as Tutorials co-chair of The Web Conference 2023, which will take place in May 2023 in Texas.

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