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Towards the Adaptive Semantic Web

Peter Dolog Nicola Henze Wolfgang Nejdl Michael Sintek. Towards the Adaptive Semantic Web. Towards the Adaptive Semantic Web: Goal. Formalize personalization techniques from Adaptive Hypermedia Re-usable formalism Applicable for Semantic Web Operate on Logic-Layer of Semantic Web Tower

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Towards the Adaptive Semantic Web

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  1. Peter Dolog Nicola Henze Wolfgang Nejdl Michael Sintek Towards the Adaptive Semantic Web

  2. Towards the Adaptive Semantic Web:Goal • Formalize personalization techniques from Adaptive Hypermedia • Re-usable formalism • Applicable for Semantic Web • Operate on Logic-Layer of Semantic Web Tower • Formalism to employ personalization techniques in Semantic Web • Rules (Triple) • RDF – annotated resources • Reasoning on distributed resources, powered by personalization rules and RDF-annotations

  3. From Adaptive Hypermedia to Adaptive Web • Semantic Web --> open world • Adaptive Hypermedia: „closed world“ • Emerging Standards: • RDF / RDF-S • DAML+OIL / OWL • Commonly-agreed schema e.g. for domain e-learning? Approaches LOM, SCORM, etc. • --> Allow mapping and comparision of resources, metadata, and ontology concepts, as well as user profile information

  4. Approach • Logic-based approach • Rules describe personalization techniques • Rules describe interpretation of user profile information • Rules reason over RDF annotations • Several ontologies: Document-, Domain, Concept-, User-Ontology plus DC/LOM-Standard • Open issues • Incomplete information • Further elaboration of mappings

  5. Logic-Based Definition of AEHS • An Adaptive Educational Hypermedia System is a Quadrupel (DOCS, UM, OBS, AC) • DOCS: Document Space: A finite set of first order logic (FOL) sentences with constant symbols for describing documents (and knowledge concepts), and predicates for defining relations between these (and other) constant symbols. • UM: User Model: A finite set of FOL sentences with constant symbols for describing individual users (user groups), and user characteristics, as well as predicates and formulas for expressing whether a characteristic applies to a user. • OBS: Observations: A finite set of FOL sentences with constant symbols for describing observations, and predicates for relating users, documents / concepts, and observations. • AC:Adaptation Component: A finite set of FOL sentences with formulas for describing adaptive functionality.

  6. Facts about a document

  7. Part of Concept Ontology for Java e-Lecture

  8. Draft of Architecture

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