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John Breslin (for Stefan Decker)

John Breslin (for Stefan Decker). Site Interoperability Projects at DERI Galway‘s SW Cluster. john.breslin@deri.org www.johnbreslin.com. Interop Issues in SW Sites 7 th February 2005. SW Cluster: Overview. SIOC: Semantically Interlinked Online Community SemanticWeb.org FOAFRealm

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John Breslin (for Stefan Decker)

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  1. John Breslin (for Stefan Decker) Site Interoperability Projects at DERI Galway‘s SW Cluster john.breslin@deri.org www.johnbreslin.com Interop Issues in SW Sites 7th February 2005

  2. SW Cluster: Overview • SIOC: Semantically Interlinked Online Community • SemanticWeb.org • FOAFRealm • RDF Datasets for Site Exchange

  3. SW Cluster: Overview • SIOC: Semantically Interlinked Online Community • SemanticWeb.org • FOAFRealm • RDF Datasets for Site Exchange

  4. SIOC: Introduction Issues with online communities: • Data on community sites cannot be harnessed correctly • Isolated communities discussing complementary topics • Information is being repeatedly requested across sites SIOC approach: • Ontology • Data Interface • Inferring Connections

  5. boards.ie boards.us boards.jp boards.geek.nz SIOC: To Interconnect Bulletin Board Sites

  6. SIOC: Ontology • Namespace at rdfs.org/sioc/ns#

  7. SIOC: Data Interface (galway +broadband +linux)

  8. SIOC: Inferring Connections

  9. SW Cluster: Overview • SIOC: Semantically Interlinked Online Community • SemanticWeb.org • FOAFRealm • RDF Datasets for Site Exchange

  10. SemanticWeb.org: Introduction • General interoperability considerations • The site • RDF/XML views of local data • Integration of remote data • Data access interface • Ontology import and export • Possible extensions

  11. SemanticWeb.org: General Interop Considerations • Basic idea is to use Semantic Web technology to allow different web sites to „work together“ • Interoperability could cover re-use and integration of other sites‘ models, data, and functionality • Presentation layer components (e.g. stylesheets for agreed-on RDF/XML structures) may be considered too

  12. SemanticWeb.org: The Site • SemanticWeb.org will (soon again ;-)) be the Semantic Web community portal • The new (RDF-enhanced) site will provide information about Semantic Web events, people, tools, organisations, projects, and other related resources • Both instance data and model information can be added, modified, extended, and exported online

  13. SemanticWeb.org: Architecture

  14. SemanticWeb.org: RDF/XML Views of Local Data • Each portal object (page, channel, blog post, user, vocabulary, SKOS concept, resource description...) can be serialized as RDF/XML • Resource Description Discovery (RDD) will be enabled by <link /> tags in XHTML, HTTP headers (X-Metadata-Location) and support for URIQA‘s MGET • Direct serving of content-negotiated XHTML vs. RDF/XML is considered bad practice (URI overloading etc.), but HTTP redirects may be triggered on certain accept-headers instead

  15. SemanticWeb.org: Integration of Remote Data • The site has an „Add URL“ feature to add remotely maintained sources to the portal • Information from remote sources will be updated via an RDF crawler (scutter) • The final RDF store (Andreas‘ YARS) is going to support HTTP PUT and POST for direct integration of data

  16. SemanticWeb.org: Data Access Interface • The final portal is going to provide an HTTP-based query interface (probably SPARQL protocol/query language compliant) • Together with the portal‘s RDD features, it will be possible to retrieve Concise Bounded Descriptions (CBDs) of resources for re-use in other environments

  17. SemanticWeb.org: Ontology Import and Export • The portal system has a built-in web-based vocabulary editor and publisher • RDFS and OWL term sets can be imported, mixed, and exported • Annotation properties are used to add machine-readable presentation information for classes (e.g. re-usable views or forms)

  18. SemanticWeb.org: Administration Screenshot

  19. SemanticWeb.org: Possible Extensions • Add support for functionality re-use (e.g. facilitated sign-up à la FOAFNet) • The views are currently generated via PHP code (ontology-guided, though) • For improved interoperability, it could make sense to completely separate the presentation layer from program code (e.g. by a stylesheet-like approach and by formally describing the way resource descriptions should be displayed)

  20. SW Cluster: Overview • SIOC: Semantically Interlinked Online Community • SemanticWeb.org • FOAFRealm • RDF Datasets for Site Exchange

  21. FOAFRealm: Introduction • A user management system with social collaborative filtering • Embedded mechanisms of authorising and controlling the sharing of resources among users • Gives different weights of votes during negotiations

  22. FOAFRealm: Features • User profiles management system based on FOAF and P2P • Information on relationships between users • On-time registration* • Single sign-on* • Access control lists based on the distance and trust level between users • Implementation of social collaborative filtering (private bookshelves, annotations, evaluations)

  23. FOAFRealm: Architecture • Multi-tiered architecture • RDF storage independent • Can be adapted to environments other than Jakarta Tomcat User Interface Guidelines FOAF Realm (Authentication Plugins) FOAF Manage RDF Storage

  24. FOAFRealm: Types of Collaborative Filtering

  25. FOAFRealm: Social Collaborative Filtering

  26. FOAFRealm: Security in Collaborative Filtering

  27. FOAFRealm: Calculating Interests

  28. FOAFRealm: Related Projects • JeromeDL – e-Library with Semantics: • FOAFRealm as a user management subsystem • Additional layer of P2P communication between instances of the digital library • Collaborative filtering as one of the semantically enhanced search services • MarcOnt Initiative: • FOAFRealm as user management subsystem • Calculating distances between community members • MarcOnt ontology considered to cover collaborative aspects

  29. FOAFRealm: JeromeDL User Profile

  30. FOAFRealm: JeromeDL Screenshot

  31. RDF Datasets for Site Exchange: Andreas • DBLP metadata about 600,000 CS journal papers, conference proceedings (~400 MB) • Cleaned-up version of dmoz.org, a human-edited directory of the web (~1.2 GB) • Recent semantic web crawl (~300 MB) consisting mostly of RSS 1.0, DC, FOAF, DOAP, and image annotations

  32. SW Cluster: Conclusion • SIOC: Semantically Interlinked Online Community • SemanticWeb.org • FOAFRealm • RDF Datasets for Site Exchange • Thanks for your attention! http://sw.deri.org/

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