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Accessibility Issues
 

Accessibility Issues

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    Accessibility Issues Accessibility Issues Presentation Transcript

    • Accessibility Issues Liddy Nevile
    • Overview
      • Accessibility definitions
      • Current work to minimise problems
      • IMS accessibility activities
      • Matching content to people’s needs
      • Implementations
      • References
    • Overview
      • Accessibility definitions
      • Not …
      • Telecommunications …. Or is it?
      • Economic equity … or is it?
    • Typical problems
      • Can’t see screen
      • Can’t see colours
      • Can’t read text
      • Can’t hear
      • Can’t control cursor
      • Can’t type
    • OS support Add this to Favorites folder Add this to startup items Apple channel …..
    • Browser support (?)
      • Lynx
      • IE
      • Netscape/Mozilla
      • iCab
      • Opera
      • Amaya
      • There are about 35 browsers in common use…
      • (Note W3C UAAG - includes LMS)
    • ATs for people with vision disabilities
    • Jason White
    • Other assistive technologies
    • Other accessibility problems
    • Accessibility definitions
      • W3C - device independence, separation of content from presentation
      • U.S. - s. 508 for Federal Govt. contracts
      • Australia - common law system with regulations
      • UK, European Commission …
      • IMS/MMI-DC Working definition: mismatch between user needs and content
    • W3C Guidelines
      • Accessibility guidelines
      • Techniques
      • Checkpoints
      • Checkpoint techniques
      • QA and Certification
      • - for authors, authoring tools, user agents
    • Localisation of W3C guidelines
      • University, system, organisational guidelines
      • Controlling systems and templates
      • EuroAccessibility efforts
      • CEN MMI-DC Workshop
      • IMS Accessibility Guidelines
      • ( -> maths interest)
    • W3C Technologies that work
      • Cascading style sheets (CSS1)
      • eXtensible Markup Language and CSS2
      • Scalable Vector Graphics (SVG)
      • Synchronised Multimedia Integration Language (SMIL)
      • eXtensible Stylesheet Language (XSLT)
      • ChemML, MathML, MusicML, ...
    • SVG example
    • SVG example
      • Image is represented as vectors in text
      • Sub-images can be identified
      • Metadata can be added
      • Rights management can be used
      • Behaviours can be controlled
        • Eg an interactive knee dissection linked to external resources
    • Technologies that work (contd.)
      • XML => MathML, ChemML, etc
      • MathML as an example
        • The equation x 2 + 4x + 4 =0
    • Separate presentation from content
      • Presentational markup to ensure display can be controlled - with style sheets to define the display characteristics
      • Content markup to provide machine readable version of content so it could be read into content manipulators
      • <mrow>
      • <mrow>
      • <msup> <mi>x</MI> <mn>2</mn> </msup> <mo>+</MO>
      • <mrow>
      • <mn>4</mn>
      • <MO>&InvisibleTimes;</MO>
      • <MI>x</MI>
      • </mrow>
      • <MO>+</MO>
      • <mn>4</mn>
      • </mrow>
      • <MO>=</MO>
      • <mn>0</mn>
      • </mrow>
      MathML is like HTML…
    • Screen presentation
      • It can be read aloud by screen readers
      • It can be used in maths applications
      • It can be programmed for interactivity
      • It can be programmed for feedback
      • But it can’t yet be used in Braille.
    • Technologies that work (contd.)
      • XML and RDF and EARL ….
      • XML - human readable, schemas etc …..
      • RDF - this ‘object’ has property ‘this’
      • EARL - this ’agent’ said this ‘object’ has this ‘property’ on this ‘date’
      • Eg “The application ‘Lift’ evaluated this page as accessible (didn’t fail) on 3/9/2002”.
    • Author support
      • W3C described what to do, how to do it, when and why,…
      • Automatic support is required ->
      • W3C Authoring Tools Accessibility Guidelines - note s. 508
    • Accessibility tools
      • Accessible tools
      • Tools for accessible authoring
      • Validators ie code validators
      • Evaluators ie compliance with guidelines producing metadata (EARL)
      • Digital repositories for descriptive metadata
      • (re-usable metadata??)
      • On-the-fly repair tools (SWAP, TILE, ..)
    • New IMS/DC/…approach
      • Think of the user and work towards user needs and preferences
      • Provide a good, easy way to record user needs and preferences
      • Describe content in terms of needs and preferences
      • Avoid all issues to do with disabilities and to do with legal liability
    • Accessibility issues
      • Direct accessibility
      • Compatible accessibility
      • Alternative modality
      • Equivalent content
      • User choice
    • User profiles
      • Control
      • Display (presentation)
      • Content
      • A special element to add to the LIP because this info is usually managed by a different person from the teacher (and sometimes the student)
      • Multiple, cascading profiles
    • AccLIP (User profile)
      • AccessForAll: http://www. imsproject .org/accessibility/
    • Content profiles
      • Control
      • Display (presentation)
      • Content
      • A separate element as the information is usually an EARL statement
      • Same schema for exact matching and easy maintenance
    • AccMD (Content profile)
      • An EARL statement … so a URI: http://www. imsproject .org/accessibility
    • Implementation
      • The Inclusive Learning Exchange at http://inclusivelearning.ca/
    • References
      • http://w3.org/
      • http://w3.org/WAI/
      • http://www. imsproject .org/accessibility
      • http:// dublincore .org/groups/access/
      • http:// inclusivelearning .ca
      • http://www. OZeWAI .org/