Delivering accessible content from Social Semantic Information Sources through Adaptive Hypermedia

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    Delivering accessible content from Social Semantic Information Sources through Adaptive Hypermedia - Presentation Transcript

    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

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