Olaf Hartig

ORCID

Publication Activity (10 Years)

Years Active: 2007-2023
Publications (10 Years): 52

Top Venues

Humboldt University of Berlin (PHD)

Education History

Humboldt University of Berlin

PHD

Publications

Shahrzad Khayatbashi, Olaf Hartig, Amin Jalali
Transforming Event Knowledge Graph to Object-Centric Event Logs: A Comparative Study for Multi-dimensional Process Analysis. ER (2023)
Christian Aebeloe, Amr Azzam, Olaf Hartig, Katja Hose
Preface. ESWC Workshops (2023)
Valeria Fionda, Olaf Hartig, Reyhaneh Abdolazimi, Sihem Amer-Yahia, Hongzhi Chen, Xiao Chen, Peng Cui, Jeffrey Dalton, Xin Luna Dong, Lisette Espín-Noboa, Wenqi Fan, Manuela Fritz, Quan Gan, Jingtong Gao, Xiaojie Guo, Torsten Hahmann, Jiawei Han, Soyeon Caren Han, Estevam Hruschka, Liang Hu, Jiaxin Huang, Utkarshani Jaimini, Olivier Jeunen, Yushan Jiang, Fariba Karimi, George Karypis, Krishnaram Kenthapadi, Himabindu Lakkaraju, Hady W. Lauw, Thai Le, Trung-Hoang Le, Dongwon Lee, Geon Lee, Liat Levontin, Cheng-Te Li, Haoyang Li, Ying Li, Jay Chiehen Liao, Qidong Liu, Usha Lokala, Ben London, Siqu Long, Hande Küçük-McGinty, Yu Meng, Seungwhan Moon, Usman Naseem, Pradeep Natarajan, Behrooz Omidvar-Tehrani, Zijie Pan, Devesh Parekh, Jian Pei, Tiago Peixoto, Steven Pemberton, Josiah Poon, Filip Radlinski, Federico Rossetto, Kaushik Roy, Aghiles Salah, Mehrnoosh Sameki, Amit P. Sheth, Cogan Shimizu, Kijung Shin, Dongjin Song, Julia Stoyanovich, Dacheng Tao, Johanne Trippas, Quoc Truong, Yu-Che Tsai, Adaku Uchendu, Bram van den Akker, Lin Wang, Minjie Wang, Shoujin Wang, Xin Wang, Ingmar Weber, Henry Weld, Lingfei Wu, Da Xu, Yifan Ethan Xu, Shuyuan Xu, Bo Yang, Ke Yang, Elad Yom-Tov, Jaemin Yoo, Zhou Yu, Reza Zafarani, Hamed Zamani, Meike Zehlike, Qi Zhang, Xikun Zhang, Yongfeng Zhang, Yu Zhang, Zheng Zhang, Liang Zhao, Xiangyu Zhao, Wenwu Zhu
Tutorials at The Web Conference 2023. WWW (Companion Volume) (2023)
Ora Lassila, Michael Schmidt, Olaf Hartig, Brad Bebee, Dave Bechberger, Willem Broekema, Ankesh Khandelwal, Kelvin Lawrence, Carlos-Manuel López-Enríquez, Ronak Sharda, Bryan B. Thompson
. Semantic Web 14 (1) (2023)
Minh Hoang Dang, Julien Aimonier-Davat, Pascal Molli, Olaf Hartig, Hala Skaf-Molli, Yotlan Le Crom
FedShop: A Benchmark for Testing the Scalability of SPARQL Federation Engines. ISWC (2023)
Huanyu Li, Olaf Hartig, Rickard Armiento, Patrick Lambrix
OBG-gen: Ontology-Based GraphQL Server Generation for Data Integration. ISWC (Posters/Demos/Industry) (2023)
Sijin Cheng, Sebastián Ferrada, Olaf Hartig
Considering Vocabulary Mappings in Query Plans for Federations of RDF Data Sources. CoopIS (2023)
Olaf Hartig, Yuichi Yoshida
GRADES-NDA'23: 6th Joint Workshop on Graph Data Management Experiences & Systems (GRADES) and Network Data Analytics (NDA). SIGMOD Conference Companion (2023)
Sijin Cheng, Olaf Hartig
A Cost Model to Optimize Queries over Heterogeneous Federations of RDF Data Sources. ESWC Workshops (2023)
Christian Esposito, Olaf Hartig, Ross Horne, Chang Sun
Assessing the Solid Protocol in Relation to Security & Privacy Obligations. CoRR (2022)
Sijin Cheng, Olaf Hartig
Towards Query Processing over Heterogeneous Federations of RDF Data Sources. ESWC (Satellite Events) (2022)
Sijin Cheng, Olaf Hartig
LinGBM: A Performance Benchmark for Approaches to Build GraphQL Servers. WISE (2022)
Sijin Cheng, Olaf Hartig
Source Selection for SPARQL Endpoints: Fit for Heterogeneous Federations of RDF Data Sources? QuWeDa@ISWC (2022)
Shahrzad Khayatbashi, Sebastián Ferrada, Olaf Hartig
Converting property graphs to RDF: a preliminary study of the practical impact of different mappings. GRADES-NDA@SIGMOD (2022)
Sijin Cheng, Olaf Hartig
LinGBM: A Performance Benchmark for Approaches to Build GraphQL Servers (Extended Version). CoRR (2022)
Sherif Sakr, Angela Bonifati, Hannes Voigt, Alexandru Iosup, Khaled Ammar, Renzo Angles, Walid G. Aref, Marcelo Arenas, Maciej Besta, Peter A. Boncz, Khuzaima Daudjee, Emanuele Della Valle, Stefania Dumbrava, Olaf Hartig, Bernhard Haslhofer, Tim Hegeman, Jan Hidders, Katja Hose, Adriana Iamnitchi, Vasiliki Kalavri, Hugo Kapp, Wim Martens, M. Tamer Özsu, Eric Peukert, Stefan Plantikow, Mohamed Ragab, Matei Ripeanu, Semih Salihoglu, Christian Schulz, Petra Selmer, Juan F. Sequeda, Joshua Shinavier, Gábor Szárnyas, Riccardo Tommasini, Antonino Tumeo, Alexandru Uta, Ana Lucia Varbanescu, Hsiang-Yun Wu, Nikolay Yakovets, Da Yan, Eiko Yoneki
The future is big graphs: a community view on graph processing systems. Commun. ACM 64 (9) (2021)
Robin Keskisärkkä, Eva Blomqvist, Olaf Hartig
Optimizing RDF Stream Processing for Uncertainty Management. SEMANTiCS (2021)
Robin Keskisärkkä, Eva Blomqvist, Leili Lind, Olaf Hartig
Capturing and Querying Uncertainty in RDF Stream Processing. EKAW (2020)
Sherif Sakr, Angela Bonifati, Hannes Voigt, Alexandru Iosup, Khaled Ammar, Renzo Angles, Walid G. Aref, Marcelo Arenas, Maciej Besta, Peter A. Boncz, Khuzaima Daudjee, Emanuele Della Valle, Stefania Dumbrava, Olaf Hartig, Bernhard Haslhofer, Tim Hegeman, Jan Hidders, Katja Hose, Adriana Iamnitchi, Vasiliki Kalavri, Hugo Kapp, Wim Martens, M. Tamer Özsu, Eric Peukert, Stefan Plantikow, Mohamed Ragab, Matei Ripeanu, Semih Salihoglu, Christian Schulz, Petra Selmer, Juan F. Sequeda, Joshua Shinavier, Gábor Szárnyas, Riccardo Tommasini, Antonino Tumeo, Alexandru Uta, Ana Lucia Varbanescu, Hsiang-Yun Wu, Nikolay Yakovets, Da Yan, Eiko Yoneki
The Future is Big Graphs! A Community View on Graph Processing Systems. CoRR (2020)
Sijin Cheng, Olaf Hartig
FedQPL: A Language for Logical Query Plans over Heterogeneous Federations of RDF Data Sources (Extended Version). CoRR (2020)
Sijin Cheng, Olaf Hartig
FedQPL: A Language for Logical Query Plans over Heterogeneous Federations of RDF Data Sources. iiWAS (2020)
Olaf Hartig, Jan Hidders
Defining Schemas for Property Graphs by using the GraphQL Schema Definition Language. GRADES/NDA@SIGMOD/PODS (2019)
Yun Wan Kim, Mariano P. Consens, Olaf Hartig
An Empirical Analysis of GraphQL API Schemas in Open Code Repositories and Package Registries. AMW (2019)
Robin Keskisärkkä, Eva Blomqvist, Leili Lind, Olaf Hartig
RSP-QL $$^{\star }\!$$ : Enabling Statement-Level Annotations in RDF Streams. SEMANTiCS (2019)
Sijin Cheng, Olaf Hartig
OPT+: A Monotonic Alternativeto OPTIONAL in SPARQL. J. Web Eng. 18 (1-3) (2019)
Olaf Hartig
Foundations to Query Labeled Property Graphs using SPARQL. SEM4TRA-AMAR@SEMANTiCS (2019)
Olaf Hartig, Ian Letter, Jorge Pérez
A Model of Distributed Query Computation in Client-Server Scenarios on the Semantic Web. IJCAI (2018)
Muhammad Saleem, Alexander Potocki, Tommaso Soru, Olaf Hartig, Axel-Cyrille Ngonga Ngomo
CostFed: Cost-Based Query Optimization for SPARQL Endpoint Federation. SEMANTiCS (2018)
Olaf Hartig, Jorge Pérez
Semantics and Complexity of GraphQL. WWW (2018)
Olaf Hartig
RDF* and SPARQL*: An Alternative Approach to Annotate Statements in RDF. ISWC (Posters, Demos & Industry Tracks) (2017)
Olaf Hartig, Ian Letter, Jorge Pérez
A Formal Framework for Comparing Linked Data Fragments. ISWC (1) (2017)
Olaf Hartig
Foundations of RDF⋆ and SPARQL⋆ (An Alternative Approach to Statement-Level Metadata in RDF). AMW (2017)
Olaf Hartig, Maria-Esther Vidal, Johann-Christoph Freytag
Federated Semantic Data Management (Dagstuhl Seminar 17262). Dagstuhl Reports 7 (6) (2017)
Alexander Potocki, Muhammad Saleem, Tommaso Soru, Olaf Hartig, Martin Voigt, Axel-Cyrille Ngonga Ngomo
Federated SPARQL Query Processing Via CostFed. ISWC (Posters, Demos & Industry Tracks) (2017)
Olaf Hartig, Olivier Curé
Semantic Data Management in Practice. WWW (Companion Volume) (2017)
Olaf Hartig, Jorge Pérez
An Initial Analysis of Facebook's GraphQL Language. AMW (2017)
Olaf Hartig, Giuseppe Pirrò
SPARQL with property paths on the Web. Semantic Web 8 (6) (2017)
Olaf Hartig, M. Tamer Özsu
Walking without a Map: Optimizing Response Times of Traversal-Based Linked Data Queries (Extended Version). CoRR (2016)
Olaf Hartig, M. Tamer Özsu
Walking Without a Map: Ranking-Based Traversal for Querying Linked Data. ISWC (1) (2016)
Olaf Hartig, Carlos Buil Aranda
Bindings-Restricted Triple Pattern Fragments. OTM Conferences (2016)
Magnus Knuth, Olaf Hartig, Harald Sack
Scheduling Refresh Queries for Keeping Results from a SPARQL Endpoint Up-to-Date (Short Paper). OTM Conferences (2016)
Ruben Verborgh, Miel Vander Sande, Olaf Hartig, Joachim Van Herwegen, Laurens De Vocht, Ben De Meester, Gerald Haesendonck, Pieter Colpaert
Triple Pattern Fragments: A low-cost knowledge graph interface for the Web. J. Web Semant. (2016)
Olaf Hartig, Carlos Buil Aranda
Reducing the Network Load of Triple Pattern Fragments by Supporting Bind Joins. ISWC (Posters & Demos) (2016)
Olaf Hartig, Jorge Pérez
LDQL: A query language for the Web of Linked Data. J. Web Semant. 41 (2016)
Magnus Knuth, Olaf Hartig, Harald Sack
Scheduling Refresh Queries for Keeping Results from a SPARQL Endpoint Up-to-Date (Extended Version). CoRR (2016)
Olaf Hartig, Carlos Buil Aranda
brTPF: Bindings-Restricted Triple Pattern Fragments (Extended Preprint). CoRR (2016)
Olaf Hartig, Giuseppe Pirrò
A Context-Based Semantics for SPARQL Property Paths over the Web (Extended Version). CoRR (2015)
Olaf Hartig, Jorge Pérez
LDQL: A Query Language for the Web of Linked Data. ISWC (1) (2015)
Olaf Hartig
LDQL: A Language for Linked Data Queries. AMW (2015)
Olaf Hartig, Giuseppe Pirrò
A Context-Based Semantics for SPARQL Property Paths Over the Web. ESWC (2015)
Olaf Hartig, Jorge Pérez
LDQL: A Query Language for the Web of Linked Data (Extended Version). CoRR (2015)
Günes Aluç, M. Tamer Özsu, Khuzaima Daudjee, Olaf Hartig
Executing queries over schemaless RDF databases. ICDE (2015)
Ruben Verborgh, Olaf Hartig, Ben De Meester, Gerald Haesendonck, Laurens De Vocht, Miel Vander Sande, Richard Cyganiak, Pieter Colpaert, Erik Mannens, Rik Van de Walle
Querying Datasets on the Web with High Availability. ISWC (1) (2014)
Günes Aluç, Olaf Hartig, M. Tamer Özsu, Khuzaima Daudjee
Diversified Stress Testing of RDF Data Management Systems. ISWC (1) (2014)
Olaf Hartig, M. Tamer Özsu
Reachable subwebs for traversal-based query execution. WWW (Companion Volume) (2014)
Olaf Hartig
Querying a web of linked data: foundations and query execution. SIGWEB Newsl. 2014 (Autumn) (2014)
Ruben Verborgh, Olaf Hartig, Ben De Meester, Gerald Haesendonck, Laurens De Vocht, Miel Vander Sande, Richard Cyganiak, Pieter Colpaert, Erik Mannens, Rik Van de Walle
Low-Cost Queryable Linked Data through Triple Pattern Fragments. ISWC (Posters & Demos) (2014)
Olaf Hartig
Reconciliation of RDF* and Property Graphs. CoRR (2014)
Olaf Hartig, M. Tamer Özsu
Linked Data query processing. ICDE (2014)
Olaf Hartig, Bryan Thompson
Foundations of an Alternative Approach to Reification in RDF. CoRR (2014)
Tom De Nies, Davide Ceolin, Paul Groth, Olaf Hartig, Stephen Marsh
Overview of METHOD 2014: the 3rd International Workshop on Methods for Establishing Trust of (Open) Data. URSW (2014)
Olaf Hartig
SQUIN: a traversal based query execution system for the web of linked data. SIGMOD Conference (2013)
Olaf Hartig
An Overview on Execution Strategies for Linked Data Queries. Datenbank-Spektrum 13 (2) (2013)
Olaf Hartig
SPARQL for a Web of Linked Data: Semantics and Computability. ESWC (2012)
Olaf Hartig, Johann-Christoph Freytag
Foundations of traversal based query execution over linked data. HT (2012)
Olaf Hartig
An Introduction to SPARQL and Queries over Linked Data. ICWE (2012)
Olaf Hartig, Tom Heath
Populating personal linked data caches using context models. WWW (Companion Volume) (2012)
Jun Zhao, Olaf Hartig
Towards Interoperable Provenance Publication on the Linked Data Web. LDOW (2012)
Olaf Hartig, Tom Heath
Query prediction with context models for populating personal linked data caches. HT (2012)
Olaf Hartig
SPARQL for a Web of Linked Data: Semantics and Computability (Extended Version) CoRR (2012)
Olaf Hartig, Frank Huber
A Main Memory Index Structure to Query Linked Data. LDOW (2011)
Olaf Hartig, Johann Christoph Freytag
Foundations of Traversal Based Query Execution over Linked Data (Extended Version) CoRR (2011)
Juan F. Sequeda, Olaf Hartig
Towards a Query Language for the Web of Data (A Vision Paper) CoRR (2011)
Olaf Hartig
How Caching Improves Efficiency and Result Completeness for Querying Linked Data. LDOW (2011)
Olaf Hartig
Zero-Knowledge Query Planning for an Iterator Implementation of Link Traversal Based Query Execution. ESWC (1) (2011)
Olaf Hartig, Jun Zhao
Publishing and Consuming Provenance Metadata on the Web of Linked Data. IPAW (2010)
Olaf Hartig, Andreas Langegger
A Database Perspective on Consuming Linked Data on the Web. Datenbank-Spektrum 10 (2) (2010)
Olaf Hartig, Juan F. Sequeda, Jamie Taylor, Patrick Sinclair
How to consume linked data on the web: tutorial description. WWW (2010)
Olaf Hartig, Jun Zhao
Using Web Data Provenance for Quality Assessment. SWPM (2009)
Olaf Hartig
Provenance Information in the Web of Data. LDOW (2009)
Olaf Hartig, Christian Bizer, Johann Christoph Freytag
Executing SPARQL Queries over the Web of Linked Data. ISWC (2009)
Olaf Hartig, Hannes Mühleisen, Johann-Christoph Freytag
Linked Data for Building a Map of Researchers. SFSW@ESWC (2009)
Olaf Hartig
Querying Trust in RDF Data with tSPARQL. ESWC (2009)
Olaf Hartig, Martin Kost, Johann Christoph Freytag
Designing Component-Based Semantic Web Applications with DESWAP. ISWC (Posters & Demos) (2008)
Olaf Hartig, Ralf Heese
The SPARQL Query Graph Model for Query Optimization. ESWC (2007)

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Publication Activity (10 Years)

Top Topics

Top Venues

Olaf Hartig