Linked Open Data and federated search

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Presentation transcript:

Linked Open Data and federated search Timo Gutjahr and Jwan Alhussein 07/10/2014 11/27/2018

Documents and Data Linked Open Data 11/27/2018

Underground Data Linked Open Data 11/27/2018

gapminder.org Linked Open Data 11/27/2018

RULES http names Get back some data Data is relationship Linked Open Data 11/27/2018

Linked Open Data 11/27/2018

Linked Open Data 11/27/2018

Linked Open Data 11/27/2018

Data Summaries for On-Demand Queries over Linked Data AIFB, Karlsruhe Institute of Technology, Germany Max-Planck Institute for Informatics, Saarbrücken, Germany Digital Enterprise Research Institute, National University of Ireland, Galway Ilmenau University of Technology, Ilmenau, Germany Andreas Harth, Katja Hose, Marcel Karnstedt, Axel Polleres, Kai-Uwe Sattler, and Jürgen Umbrich Linked Open Data 7/9/2014

For triple patterns this number is directly available: ● Recall, each QTree bucket stores a set of (URI,count)-pairs ● All query-relevant buckets are known after source selection Linked Open Data 11/27/2018

Example - RDF Graph Linked Open Data 11/27/2018

Graph as Triples Linked Open Data 11/27/2018

Mathias Konrath, Thomas Gottron, Steffen Staab, Ansgar Scherp SchemEX – Efficient Construction of a Data Catalogue by Stream-based Indexing of Linked Data WeST – Institute for Web Science and Technologies, University of Koblenz-Landau, 56070 Koblenz, Germany Mathias Konrath, Thomas Gottron, Steffen Staab, Ansgar Scherp Linked Open Data 7/9/2014

Linked Open Data Cloud Every data source has a Schema but we don’t know it! Every data source has his own SPARQL entry point. Which data source? Where to find resources of a type? Linked Open Data 11/27/2018

Example - RDF Graph Linked Open Data 11/27/2018

RDF Classes Linked Open Data 11/27/2018

Example - RDF Graph Linked Open Data 11/27/2018

Type Cluster For every combination of types instances are existing an Type Cluster is created Linked Open Data 11/27/2018

Example - RDF Graph Linked Open Data 11/27/2018

Equivalence Classes Linked Open Data 11/27/2018

Example - RDF Graph Linked Open Data 11/27/2018

Index Structure Linked Open Data 11/27/2018

Example: RDF graph to schema Linked Open Data 11/27/2018

Evaluation Precision and Recall Recall 71% - 98 % Precision 74% - 100% Linked Open Data 11/27/2018

Evaluation Linked Open Data 11/27/2018

Conclusion SchemEX vs. QTree SchemEx QTree Schema-based index Small size Linear time complexity QTree Instance-based index Ranking Very small size Linked Open Data 11/27/2018

References Andreas Harth, Katja Hose, Marcel Karnstedt, Axel Polleres, Kai-Uwe Sattler, and Jürgen Umbrich. Data summaries for on-demand queries over linked data. In Proc. of the WWW 2010. http://doi.acm.org/10.1145/1772690.1772733 M. Konrath, T. Gottron, S. Staab, and A. Scherp. SchemEX – Efficient Construction of a Data Catalogue by Stream-based Indexing of Linked Data. Web Semantics: Science, Services and Agents on the World Wide Web, 16(5), 2012. M. Konrath. SchemEX – Schema-Extraktion von Linked Open Data. Master-Arbeit, Institute for Web Science and Technologies, Universität Koblenz-Landau, FB4 Informatik. 2011. Linked Open Data 11/27/2018

Linked Open Data 11/27/2018

Linked Open Data 11/27/2018