Olaf Hartig

Affiliations:
  • Linköping University, Sweden
  • University of Waterloo, Cheriton School of Computer Science (former)
  • Humboldt University of Berlin, Department of Computer Science (former)


According to our database1, Olaf Hartig authored at least 88 papers between 2007 and 2023.

Collaborative distances:
  • Dijkstra number2 of four.
  • Erdős number3 of four.

Timeline

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Bibliography

2023
The OneGraph vision: Challenges of breaking the graph model lock-in<sup>1</sup>.
Semantic Web, 2023


GRADES-NDA'23: 6th Joint Workshop on Graph Data Management Experiences & Systems (GRADES) and Network Data Analytics (NDA).
Proceedings of the Companion of the 2023 International Conference on Management of Data, 2023

FedShop: A Benchmark for Testing the Scalability of SPARQL Federation Engines.
Proceedings of the Semantic Web - ISWC 2023, 2023

OBG-gen: Ontology-Based GraphQL Server Generation for Data Integration.
Proceedings of the ISWC 2023 Posters, 2023

A Cost Model to Optimize Queries over Heterogeneous Federations of RDF Data Sources.
Proceedings of the Joint Proceedings of the ESWC 2023 Workshops and Tutorials co-located with 20th European Semantic Web Conference (ESWC 2023), 2023

Preface.
Proceedings of the Joint Proceedings of the ESWC 2023 Workshops and Tutorials co-located with 20th European Semantic Web Conference (ESWC 2023), 2023

Transforming Event Knowledge Graph to Object-Centric Event Logs: A Comparative Study for Multi-dimensional Process Analysis.
Proceedings of the Conceptual Modeling - 42nd International Conference, 2023

Considering Vocabulary Mappings in Query Plans for Federations of RDF Data Sources.
Proceedings of the Cooperative Information Systems - 29th International Conference, 2023

2022
Assessing the Solid Protocol in Relation to Security & Privacy Obligations.
CoRR, 2022

LinGBM: A Performance Benchmark for Approaches to Build GraphQL Servers (Extended Version).
CoRR, 2022

LinGBM: A Performance Benchmark for Approaches to Build GraphQL Servers.
Proceedings of the Web Information Systems Engineering - WISE 2022, 2022

Source Selection for SPARQL Endpoints: Fit for Heterogeneous Federations of RDF Data Sources?
Proceedings of the QuWeDa 2022: 6th Workshop on Storing, 2022

Converting property graphs to RDF: a preliminary study of the practical impact of different mappings.
Proceedings of the GRADES-NDA '22: Proceedings of the 5th ACM SIGMOD Joint International Workshop on Graph Data Management Experiences & Systems (GRADES) and Network Data Analytics (NDA), 2022

Towards Query Processing over Heterogeneous Federations of RDF Data Sources.
Proceedings of the Semantic Web: ESWC 2022 Satellite Events - Hersonissos, Crete, Greece, May 29, 2022

2021
The future is big graphs: a community view on graph processing systems.
Commun. ACM, 2021

Optimizing RDF Stream Processing for Uncertainty Management.
Proceedings of the Further with Knowledge Graphs, 2021

2020
FedQPL: A Language for Logical Query Plans over Heterogeneous Federations of RDF Data Sources (Extended Version).
CoRR, 2020

FedQPL: A Language for Logical Query Plans over Heterogeneous Federations of RDF Data Sources.
Proceedings of the iiWAS '20: The 22nd International Conference on Information Integration and Web-based Applications & Services, Virtual Event / Chiang Mai, Thailand, November 30, 2020

Capturing and Querying Uncertainty in RDF Stream Processing.
Proceedings of the Knowledge Engineering and Knowledge Management, 2020

2019
Linked Data Management.
Proceedings of the Encyclopedia of Big Data Technologies., 2019

Federated RDF Query Processing.
Proceedings of the Encyclopedia of Big Data Technologies., 2019

OPT+: A Monotonic Alternativeto OPTIONAL in SPARQL.
J. Web Eng., 2019

RSP-QL $$^{\star }\!$$ : Enabling Statement-Level Annotations in RDF Streams.
Proceedings of the Semantic Systems. The Power of AI and Knowledge Graphs, 2019

Foundations to Query Labeled Property Graphs using SPARQL.
Proceedings of the Joint Proceedings of the 1st International Workshop On Semantics For Transport and the 1st International Workshop on Approaches for Making Data Interoperable co-located with 15th Semantics Conference (SEMANTiCS 2019), 2019

Defining Schemas for Property Graphs by using the GraphQL Schema Definition Language.
Proceedings of the 2nd Joint International Workshop on Graph Data Management Experiences & Systems (GRADES) and Network Data Analytics (NDA), 2019

An Empirical Analysis of GraphQL API Schemas in Open Code Repositories and Package Registries.
Proceedings of the 13th Alberto Mendelzon International Workshop on Foundations of Data Management, 2019

2018
Semantics and Complexity of GraphQL.
Proceedings of the 2018 World Wide Web Conference on World Wide Web, 2018

A Model of Distributed Query Computation in Client-Server Scenarios on the Semantic Web.
Proceedings of the Twenty-Seventh International Joint Conference on Artificial Intelligence, 2018

CostFed: Cost-Based Query Optimization for SPARQL Endpoint Federation.
Proceedings of the 14th International Conference on Semantic Systems, 2018

2017
SPARQL with property paths on the Web.
Semantic Web, 2017

Federated Semantic Data Management (Dagstuhl Seminar 17262).
Dagstuhl Reports, 2017

Semantic Data Management in Practice.
Proceedings of the 26th International Conference on World Wide Web Companion, 2017

Federated SPARQL Query Processing Via CostFed.
Proceedings of the ISWC 2017 Posters & Demonstrations and Industry Tracks co-located with 16th International Semantic Web Conference (ISWC 2017), Vienna, Austria, October 23rd - to, 2017

A Formal Framework for Comparing Linked Data Fragments.
Proceedings of the Semantic Web - ISWC 2017, 2017

RDF* and SPARQL*: An Alternative Approach to Annotate Statements in RDF.
Proceedings of the ISWC 2017 Posters & Demonstrations and Industry Tracks co-located with 16th International Semantic Web Conference (ISWC 2017), Vienna, Austria, October 23rd - to, 2017

Foundations of RDF⋆ and SPARQL⋆ (An Alternative Approach to Statement-Level Metadata in RDF).
Proceedings of the 11th Alberto Mendelzon International Workshop on Foundations of Data Management and the Web, 2017

An Initial Analysis of Facebook's GraphQL Language.
Proceedings of the 11th Alberto Mendelzon International Workshop on Foundations of Data Management and the Web, 2017

2016
Querying a Web of Linked Data - Foundations and Query Execution
Studies on the Semantic Web 24, IOS Press, ISBN: 978-1-61499-631-6, 2016

Triple Pattern Fragments: A low-cost knowledge graph interface for the Web.
J. Web Semant., 2016

LDQL: A query language for the Web of Linked Data.
J. Web Semant., 2016

Scheduling Refresh Queries for Keeping Results from a SPARQL Endpoint Up-to-Date (Extended Version).
CoRR, 2016

Walking without a Map: Optimizing Response Times of Traversal-Based Linked Data Queries (Extended Version).
CoRR, 2016

brTPF: Bindings-Restricted Triple Pattern Fragments (Extended Preprint).
CoRR, 2016

Walking Without a Map: Ranking-Based Traversal for Querying Linked Data.
Proceedings of the Semantic Web - ISWC 2016, 2016

Reducing the Network Load of Triple Pattern Fragments by Supporting Bind Joins.
Proceedings of the ISWC 2016 Posters & Demonstrations Track co-located with 15th International Semantic Web Conference (ISWC 2016), 2016

Scheduling Refresh Queries for Keeping Results from a SPARQL Endpoint Up-to-Date (Short Paper).
Proceedings of the On the Move to Meaningful Internet Systems: OTM 2016 Conferences, 2016

Bindings-Restricted Triple Pattern Fragments.
Proceedings of the On the Move to Meaningful Internet Systems: OTM 2016 Conferences, 2016

2015
LDQL: A Query Language for the Web of Linked Data (Extended Version).
CoRR, 2015

A Context-Based Semantics for SPARQL Property Paths over the Web (Extended Version).
CoRR, 2015

Executing queries over schemaless RDF databases.
Proceedings of the 31st IEEE International Conference on Data Engineering, 2015

A Context-Based Semantics for SPARQL Property Paths Over the Web.
Proceedings of the Semantic Web. Latest Advances and New Domains, 2015

LDQL: A Language for Linked Data Queries.
Proceedings of the 9th Alberto Mendelzon International Workshop on Foundations of Data Management, Lima, Peru, May 6, 2015

2014
Querying a Web of Linked Data.
PhD thesis, 2014

Querying a web of linked data: foundations and query execution.
SIGWEB Newsl., 2014

Foundations of an Alternative Approach to Reification in RDF.
CoRR, 2014

Reconciliation of RDF* and Property Graphs.
CoRR, 2014

Reachable subwebs for traversal-based query execution.
Proceedings of the 23rd International World Wide Web Conference, 2014

Low-Cost Queryable Linked Data through Triple Pattern Fragments.
Proceedings of the ISWC 2014 Posters & Demonstrations Track a track within the 13th International Semantic Web Conference, 2014

Querying Datasets on the Web with High Availability.
Proceedings of the Semantic Web - ISWC 2014, 2014

Overview of METHOD 2014: the 3rd International Workshop on Methods for Establishing Trust of (Open) Data.
Proceedings of the 10th International Workshop on Uncertainty Reasoning for the Semantic Web (URSW 2014) co-located with the 13th International Semantic Web Conference (ISWC 2014), 2014

Diversified Stress Testing of RDF Data Management Systems.
Proceedings of the Semantic Web - ISWC 2014, 2014

Linked Data query processing.
Proceedings of the IEEE 30th International Conference on Data Engineering, Chicago, 2014

Linked Data Query Processing Based on Link Traversal.
Proceedings of the Linked Data Management., 2014

2013
An Overview on Execution Strategies for Linked Data Queries.
Datenbank-Spektrum, 2013

SQUIN: a traversal based query execution system for the web of linked data.
Proceedings of the ACM SIGMOD International Conference on Management of Data, 2013

2012
SPARQL for a Web of Linked Data: Semantics and Computability (Extended Version)
CoRR, 2012

Towards Interoperable Provenance Publication on the Linked Data Web.
Proceedings of the WWW2012 Workshop on Linked Data on the Web, 2012

Populating personal linked data caches using context models.
Proceedings of the 21st World Wide Web Conference, 2012

An Introduction to SPARQL and Queries over Linked Data.
Proceedings of the Web Engineering - 12th International Conference, 2012

Query prediction with context models for populating personal linked data caches.
Proceedings of the 23rd ACM Conference on Hypertext and Social Media, 2012

Foundations of traversal based query execution over linked data.
Proceedings of the 23rd ACM Conference on Hypertext and Social Media, 2012

SPARQL for a Web of Linked Data: Semantics and Computability.
Proceedings of the Semantic Web: Research and Applications, 2012

2011
Towards a Query Language for the Web of Data (A Vision Paper)
CoRR, 2011

Foundations of Traversal Based Query Execution over Linked Data (Extended Version)
CoRR, 2011

A Main Memory Index Structure to Query Linked Data.
Proceedings of the WWW2011 Workshop on Linked Data on the Web, 2011

How Caching Improves Efficiency and Result Completeness for Querying Linked Data.
Proceedings of the WWW2011 Workshop on Linked Data on the Web, 2011

Zero-Knowledge Query Planning for an Iterator Implementation of Link Traversal Based Query Execution.
Proceedings of the Semantic Web: Research and Applications, 2011

2010
A Database Perspective on Consuming Linked Data on the Web.
Datenbank-Spektrum, 2010

How to consume linked data on the web: tutorial description.
Proceedings of the 19th International Conference on World Wide Web, 2010

Publishing and Consuming Provenance Metadata on the Web of Linked Data.
Proceedings of the Provenance and Annotation of Data and Processes, 2010

2009
Provenance Information in the Web of Data.
Proceedings of the WWW2009 Workshop on Linked Data on the Web, 2009

Using Web Data Provenance for Quality Assessment.
Proceedings of the First International Workshop on the role of Semantic Web in Provenance Management (SWPM 2009), 2009

Executing SPARQL Queries over the Web of Linked Data.
Proceedings of the Semantic Web - ISWC 2009, 8th International Semantic Web Conference, 2009

Linked Data for Building a Map of Researchers.
Proceedings of the Fifth Workshop on Scripting and Development for the Semantic Web , 2009

Querying Trust in RDF Data with tSPARQL.
Proceedings of the Semantic Web: Research and Applications, 2009

2008
Designing Component-Based Semantic Web Applications with DESWAP.
Proceedings of the Poster and Demonstration Session at the 7th International Semantic Web Conference (ISWC2008), 2008

2007
The SPARQL Query Graph Model for Query Optimization.
Proceedings of the Semantic Web: Research and Applications, 2007


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