1. Copyright 2008 Digital Enterprise Research Institute. All rights reserved. Digital Enterprise Research Institute www.deri.ie 1 From OntoSelect to OntoSelect-SWSE Paul Buitelaar, Andreas Harth DERI – NUIG, Galway February 2009

2. Digital Enterprise Research Institute www.deri.ie 2 Outline OntoSelect @ DFKI Recap of OntoSelect Functionality OntoSelect @ DERI SWSE: Semantic Web Search Engine Architecture OntoSelect-SWSE OntoSelect-SWSE Experiments Ranked List of Ontologies with Rich Metadata

3. Digital Enterprise Research Institute www.deri.ie 3 OntoSelect Ontology Library and Ontology Search Service http://olp.dfki.de/OntoSelect OntoSelect monitors the web for ontologies (indexing/updates) Ontology browse and search (by keyword, topic, document) Class, property and (multilingual) label browse and search Ontology publishing (submit your ontology) Statistics on – Formats – Human languages – Frequently used labels – Ontology publishing

4. Digital Enterprise Research Institute www.deri.ie 4 Browse Ontologies

5. Digital Enterprise Research Institute www.deri.ie 5 Ontology Search

6. Digital Enterprise Research Institute www.deri.ie 6 Expand Search with Wikipedia Topic

7. Digital Enterprise Research Institute www.deri.ie 7 Keyword Extraction & Ranked Ontologies

8. Digital Enterprise Research Institute www.deri.ie 8 OntoSelect Statistics - Multilinguality Distribution of languages in 136 ontologies with multilingual labels - out of 1530 ontologies currently collected (~9%)

9. Digital Enterprise Research Institute www.deri.ie 9 OntoSelect Statistics - Labels Most frequently used labels (words, terms) in 1530 ontologies

10. Digital Enterprise Research Institute www.deri.ie 10 SWSE: Semantic Web Search Engine

11. Digital Enterprise Research Institute www.deri.ie 11 SWSE Architecture Distributed shared-nothing architecture Implementation scales to billions of triples

12. Digital Enterprise Research Institute www.deri.ie 12 OntoSelect-SWSE

13. Digital Enterprise Research Institute www.deri.ie 13 OntoSelect-SWSE Experiments Experiment Onto Seed set from Google & Yahoo (*.owl, *.daml, *.rdfs) 27,519 data sources (ontologies) 6.5m statements Experiment Web Crawling six degrees from seed URI http://www.w3.org/People/Berners-Lee/card 100,555 data sources (instance data + ontologies) 11.9m statements

14. Digital Enterprise Research Institute www.deri.ie 14 Ranked List of Ontologies - Onto

15. Digital Enterprise Research Institute www.deri.ie 15 Ranked List of Ontologies - Web

16. Digital Enterprise Research Institute www.deri.ie 16 Conclusion SWSE framework facilitates web data experiments Taking into account real-world instance usage improves ontology ranking Web data is noisy (more data providers == more noise) Ontology registry should include rating facility to vote out data sources that do not provide consensus view