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Delivering accessible content from Social Semantic Information Sources through Adaptive Hypermedia

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How to use social semantic information sources s dataset for adaptive hypermedia systems respecting WAI guidelines.

How to use social semantic information sources s dataset for adaptive hypermedia systems respecting WAI guidelines.

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  • 1. Delivering accessible content from Social Semantic Information Sources through Adaptive Hypermedia Filip Maciej Czaja Filip Maciej Czaja [email_address] SemInf, 23.05.2007
  • 2. Presentation outline
    • Informal Knowledge
    • Social Semantic Information Sources (SSIS)
    • Accessibility and WAI Initiative
    • Adaptive Hypermedia (AH)
    • SSIS as dataset for AH
    • Future work
  • 3. Motivation
    • Many information sources are not fully exploited.
    • Access to the web is still hard for disabled people.
    • Interesting adaptive hypermedia techniques work only on prepared datasets.
    • Semantic information is often omitted in content adaptation process.
  • 4. Informal knowledge
    • Over 70% of our knowledge comes from informal sources
    • Everybody use them
    • Not well structured
    • No extensive documentation
    • Example: wikis, blogs, youtube, ...
  • 5. Social Semantic Information Sources
    • Compilation of Semantic Web and social networking
    • Combine advantages of Web 2.0 and SW
    • Resources and people related to the resources are linked together
    • Semantic plugins available for most popular blogging frameworks, wikis, etc.
    • Common examples: semantic wikis, semantic blogs, semantic digital libraries (JeromeDL)
  • 6. Model of SSIS
    • Common components between SSIS:
      • Content
      • Traditional content description (title, authors, ... )
      • Semantic description (semantic metadata)
      • Semantic annotations
    • Aspect of user's collaboration
    • SIOC ontology for modelling SSIS
  • 7. Main SIOC terms
  • 8. Accessibility
    • Many various aspects of “accessibility”
    • What kind of accessibility do we mean?
    • Real life accessibility aspects:
      • Transportation
      • Housing
      • ...
    • Most common aspect of accessibility in Web: making the use of Web resources possible for disabled people
  • 9. Web Accessibility Initiative (WAI)
    • Introduced by World Wide Consortium (W3C)
    • WAI aims at improving Web accessibility by developing the following products:
      • Web Content Accessibility Guidelines (WCAG)
      • Authoring Tool Accessibility Guidelines (ATAG)
      • User Agent Accessibility Guidelines (UAAG)
  • 10. WAI components diagram
  • 11. WAI vs. Rich Internet Applications
    • Rich Internet applications:
      • DHTML, AJAX, ...
      • Accessibility problems because of the (X)HTML limitations
      • Rich content not accessible for screen readers
      • Beauty & Usability & Innovation vs. Accessibility
    • WAI works on guidelines for Accessible Rich Internet Applications (ARIA)
      • providing information about user interface controls to assistive technologies
      • Roles, properties and states
      • Easy to apply
  • 12. Adaptive hypermedia
    • Regular hypermedia structure base on large set of documents (text, media, etc.) linked together.
    • Adaptive hypermedia:
      • Concept of AH does not introduce any revolutionary technology
      • Techniques for adaptive content presentation and navigation based on model of the user
      • AH Techniques designed mostly for specially prepared hypermedia content (additional annotations, many variants of the same concept, etc.)
  • 13. Adaptive hypermedia systems
    • “ By adaptive hypermedia systems we mean all hypertext and hyper-media systems which respect some features of the user in the user model and apply this model to adapt various visible aspects of the system to the user.”
    • Peter Brusilovsky
    • 3 basic criteria for AH systems:
      • work on hypertext or hypermedia dataset
      • use a user model as a source of information about user's needs and preferences
      • should be able to adapt the data it works on (hypertext/hypermedia dataset) to user's needs according to the information extracted from user's mode
  • 14. Adaptive Hypermedia: user model
    • Most common aspects used while modelling user in Adaptive Hypermedia systems:
  • 15. Adaptable elements and methods
    • Presentation
      • additional explanation
      • prerequisite/comparative explanations
      • explanation variants
      • sorting
    • Navigation
      • global guidance
      • local guidance
      • global orientation support
      • local orientation support
      • managed personalized views
  • 16. Adaptive Hypermedia Challenges
    • How to use existing information sources, which are not prepared for AH purposes?
    • How to convince authors to put extra effort?
    • Use of Adaptive Hypermedia in case of:
      • systems without limited, predefined set of tasks
      • fuzzy and constantly changing goals
    • User modelling related issues:
      • defining goals, knowledge, ...
      • gathering data
      • keeping data up to date
  • 17. SSIS as dataset for AH
    • Possible use of existing information sources in AH systems without any manual data transformation
    • Which AH techniques can we use to improve browsing of SSIS (presentation, navigation, ...)?
    • Content is not prepared for AH purposes but contains semantic information
    • Reasoning over semantic metadata and annotations used for AH purposes:
      • comparative explanation
      • additional information
      • explanation variants
      • ...
  • 18. IKAR – Informal Knowledge Adapter
    • Prototype for adaptation of presentation of SSIS content
    • Part of Didaskon eLearning Framework
      • Didaskon prepares content of SSIS basing on their semantic annotations and common structure
      • Content of SSIS delivered as Learning Object Metadata (LOM standard)
      • User modelling basing on FOAFRealm component
    • Adheres to WAI guidelines
  • 19. IKAR: idea and techniques
    • Uses AH Strechtext technique for providing additional explanation
    • 3 classes of links:known, unknown and external
    • Default adaptation:
      • Known links collapsed
      • Unknown links expanded
    • 2 display modes:
      • regular (additional explanations injected into content)
      • sidenotes mode
    • Accessibility
      • WAI-ARIA guidelines applied: roles, properties and states
      • Automatic content transformation according to WCAG 1.0
  • 20. IKAR: default adaptation example
  • 21. IKAR: sidenotes mode example
  • 22. Future work
    • Possible use of other AH techniques, also for navigation.
    • Improvement of Accessibility Adaptation engine.
    • Applying SSIS to real life eLearning scenarios as support or extension for formal knowledge