Bibster A Semantics-Based Bibliographic Peer-to-Peer System

1. BibsterA Semantics-Based BibliographicPeer-to-Peer System Peter Haase, Steffen Staab, Rudi Studer, Frank van Harmelen, Michal Plechawski& the Bibster Team Developers Dayat the WWW ´04 http://swap.semanticweb.org/

2. Scenario • Scenario: Sharing of bibliographic metadata in a Peer-to-Peer network • Bibliographic metadata is created and maintained in a decentralized manner • Researchers are willing to share their data • Use of semantics is crucial in this setting • The Bibster system allows to: • Easily share bibliographic data • Save work in finding this data • Avoid re-typing this data by hand

3. Informer Communication Adapter JXTA Network Knowledge Sources Bibster / SWAP System Architecture Local Node Repository User Interface Query Query Replier Answer Knowledge Source Integration Message Statements

4. Semantic Methods in Bibster • Semantic representation and querying of metadata • Extraction and classification from e.g. BibTeX files • Semantic Web Research Community Ontology andACM Topic hierarchy as light-weight ontologies • Peer selection using semantic topologies • Scalability requires intelligent query routing • Semantic descriptions of peers´ expertise to build semantic topologies as basis for peer selection • Peers with similar expertise are clustered • Semantic duplicate detection • Highly redundant and inconsistent representation of bibliographic metadata • Semantic similarity measures to detect duplicates

5. SWRC as base ontology: models domain of research community ACM Topic hierarchy 1287 topics from Computer Science Domain for classification of metadata InformationSystems Data Information Storageand Retrieval DatabaseMgmt Files DatabaseLanguages Information Searchand Retrieval DigitalLibraries subTopic seeAlso Semantic Representation of Metadata Publication Person Topic author isAbout subClass Article InProceedings Misc

6. Sample BibTeX Entry @ARTICLE{codd81relational, author = {Edgar F. Codd}, title = {The capabilities of relational database management systems}, journal = {IBM Research Report, San Jose, California}, volume = {RJ3132}, year = {1981} }

7. Article Person rdf:type codd_81_relational rdf:type isAbout author ACMTopic/Information_Systems/ Database_Management edgar_f_codd firstName lastName Edgar Codd journal year middleName title 1981 volume F. RJ3132 The capabilities of relational database management systems IBM Research Report, San Jose, California Sample Entry

8. Demo …

9. Conclusion • Download: http://bibster.semanticweb.org/ • Open source (GNU public license)https://sourceforge.net/projects/bibster/ • Potential Contributions by You: • Software aspects • User Interface • Performance optimizations • Research aspects • Heterogeneous, evolving ontologies • Alternative Query Routing

10. Questions, Discussion SWAP project: http://swap.semanticweb.org/ Bibster subproject: http://bibster.semanticweb.org/

11. Contact Feel free to contact us for detailed information! General issues:Peter Haase haase@aifb.uni-karlsruhe.de Tel: +49 (0) 721 608 – 37 05 Support: Björn Schnizler bjoern.schnizler@iw.uni-karlsruhe.de Tel: +49 (0) 721 608 - 83 85 http://bibster.semanticweb.org/ University of Karlsruhe VU Amsterdam Empolis Poland