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Flink: Lessons of interoperability

Flink: Lessons of interoperability. Peter Mika Dept. of Business Informatics Free University Amsterdam http://www.cs.vu.nl/~pmika/ 1 st Intl. Workshop on Interoperability of SW portals. Content. Flink Interoperability Flink + Interoperability. What is Flink?.

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Flink: Lessons of interoperability

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  1. Flink: Lessons of interoperability Peter Mika Dept. of Business Informatics Free University Amsterdam http://www.cs.vu.nl/~pmika/ 1st Intl. Workshop on Interoperability of SW portals

  2. Content • Flink • Interoperability • Flink + Interoperability

  3. What is Flink? • Flink is a directory of Semantic Web research • Browse the social network of all authors at ISWC ‘01-’04 • Profiles with personal information, emails, publications • View statistics • Download profiles in FOAF format • Export for Social Network Analysis • Demonstration of latest SW technology • 1st prize at the Semantic Web Challenge (2004) • Open source (soon) Try it! http://flink.semanticweb.org

  4. Technology highlights • Social network mining from the Web and other legacy sources (emails, publications) • Social networks based ontology extraction • Collection of FOAF data from the SW (“scuttering”) • Aggregation and identity reasoning (“smushing”) • Custom inferencing using Sesame • OWL use • sameAs, inverse functional properties • Web Service integration • geographic lookup • WML interface • …

  5. SemanticWeb Emails Web Publications Web mining FOAF profiles IMAP or POP3 Google Scholar, Bibster Sesame Sesame Sesame Sesame Sesame RDF storage Metadata enrichment (Identity reasoning, geographic lookup) JUNG Network API Network analysis Web application

  6. Interoperability (1) • Interoperability on the knowledge level= syntax + semantics + context • Syntax • Easy (but a ‘forgiving’ parser would be nice) • Semantics • Doable: shared ontologies, ontology mapping (e.g. for foaf:interests), unique object identification (e.g. for foaf:Person), • Context • Challenge

  7. Interoperability (2): Context • Provenance: where the information comes from, when was it collected? • Time-to-live: how long is it going to stay valid? • Trust and ratings: is it considered trustworthy (by someone), is it important (for someone)? • Security: who can access it and how? • …

  8. Interoperability (3):Process • How do we find each other? • Registries vs. pointers • How do we exchange? • Connectivity • Protocol (e.g. subscriptions vs. advertizements) • What do we exchange? • Files, access etc. • Why would we exchange? • The economics

  9. Flink and the FOAF-web • Flink interoperates with the FOAF-web • Producer and consumer of FOAF data • But: 762 other definitions of Person (www.swoogle.org), including swrc:Person • FOAF-web is the kind of nightmare the SW promises to be • Open, decentralized system • Distributed data and services • Issues of syntax and semantics • Lack of authority, privacy etc.

  10. Flink and the FOAF-web (2) • Majority of files are incorrect XML, RDF or FOAF • Errors from the obvious to the sneaky • e.g. <foaf:mbox_sha1sum /> • Ignore • FOAF extensions • What to do with them? • Ignore on import, don’t export • FOAF interests? • A ‘loose end’ in FOAF (like dc:Creator) • Ignore (on import) • Who is right? • Let the user decide

  11. How to contact Dan Brickley?

  12. Summary • Interoperability is a challenge: • Knowledge: syntax + semantics + context • Process • Interoperability is about coming to an agreement • Realize the trade-off between level of commitment vs. scale

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