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Databases and Hypermedia Group

Specification of Adaptive Behavior Using a General-purpose Design Methodology for Dynamic Web Applications. Databases and Hypermedia Group. Outline. AHS and Modern WIS Hera Methodology Adaptive Application Design Example Implementation Conclusion. Adaptive Hypermedia Systems.

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Databases and Hypermedia Group

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  1. Specification of Adaptive Behavior Using a General-purpose Design Methodology for Dynamic Web Applications Databases and Hypermedia Group

  2. Outline • AHS and Modern WIS • Hera Methodology • Adaptive Application Design Example • Implementation • Conclusion

  3. Adaptive Hypermedia Systems • Monitor user’s actions • Dynamically update a user model • Based on the user model adapt an application’s user interface

  4. Modern WIS • Are based on the Web • Provide complex services (functionality) • Use data distributed over Internet • Have large audience (need of personalization)

  5. WIS Architecture

  6. Hera, a Model-driven Methodology • Conceptual Model (CM) describes data content used for generation of hypermedia presentations) • Application Model (AM) describes the navigation structure and functionality • Presentation Model (PM) describes spatial layout and rendering of hypermedia presentations

  7. Hera WIS Architecture

  8. Example: Adaptive Application in Hera • Stores information about books and authors • Stores users’ selection of books (shopping basket) • Calculates user interest in particular authors (based on the user selection) and shows info about the most interesting authors

  9. Example CM and Navigation Data Model • NDM extends CM with notion of updatable context information (user selection, interests)

  10. Example AM • Defines the navigation structure and functionality • Creates and deletes basket instances • Creates Interest instances • Increases Interest.degree for authors of selected books • Decreases Interest.degree for other authors

  11. Hera Engine Implementation • Runs as a servlet under Apache Tomcat Web server • Uses the HP Jena RDF API for import of models (CM+NDM, AM) • Uses the Sesame RDF data repository for navigation data (also for the main data content), queries and data manipulations are in SeRQL/RQL

  12. Conclusion • It is possible to model (and implement) an adaptive hypermedia system using a general-purpose WIS design methodology • Model-driven methodologies allow schema-level adaptation • Possible adaptation techniques depend on a concrete methodology; for current version of Hera it is only conditional inclusion of fragments (slices)

  13. Questions?

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