Crosswalk

Updated May 2019

Accessibility metadata for digital books is drawn from three main sources, which are cross-walked here.

EPUB and ONIX

The EPUB Accessibility 1.0 specification defines the following metadata terms, some of which are also defined in ONIX. Note that the conformsTo term used in EPUB is drawn from Dublin Core.

EPUB ONIX
certifiedBy
certifierReport List: 196; Code: 94: Compliance web page for detailed accessibility information or, if a publisher is self-certifying, Code: 96: Publisher’s web page for detailed accessibility information
certifierCredential
link rel="dcterms:conformsTo" href="http://www.idpf.org/epub/a11y/accessibility-20170105.html#wcag-a" List: 196; Code: 02: EPUB Accessibility Specification 1.0 A
link rel="dcterms:conformsTo" href="http://www.idpf.org/epub/a11y/accessibility-20170105.html#wcag-aa" List: 196; Code: 03: EPUB Accessibility Specification 1.0 AA

Schema.org and ONIX

Schema.org includes a large group of accessibility metadata properties which are referenced in the EPUB Accessibility 1.0 specification, some of which are also defined in ONIX:

schema.org ONIX
accessibilityFeature (vocabulary list follows) List 196 (specific codes follow)
    alternativeText List: 196; Code: 14: Short alternative descriptions
    annotations
    audioDescription
    bookmarks N/A (Reading system feature)
    braille
    captions
    ChemML List: 196; Code: 18: Accessible chem content
    describedMath
    displayTransformability
    highContrastAudio
    highContrastDisplay
    index List: 196; Code: 12: Index navigation
    largePrint
    latex
    longDescription List: 196; Code: 15: Full alternative descriptions; 16: Visualised data also available as non-graphical data
    MathML List: 196; Code: 17: Accessible math content
    none
    printPageNumbers List: 196; Code: 19: Print-equivalent page numbering
    readingOrder List: 196; Code: 13: Reading order
    rubyAnnotations
    signLanguage
    structuralNavigation
    sychronizedAudioText List: 196; Code: 20: Synchronised pre-recorded audio
    tableOfContents List: 196; Code: 11: Table of contents navigation
    taggedPDF
    tactileGraphic
    tactileObject
    timingControl
    transcript
    ttsMarkup List: 196; Code: 21: Text-to-speech hinting provided; 22: Language tagging provided
    unlocked
List: 196; Code 22: Language tagging provided – helps with TTS in multi-lingual content
List: 196; Code 24: Dyslexia readability
List: 196; Code 09: Inaccessible
List: 196; Code 10: No reading system accessibility options disabled
accessibilityHazard (vocabulary list follows)
    flashing
    noFlashingHazard
    motionSimulation
    noMotionSimulationHazard
    sound
    noSoundHazard
    unknown
accessibilityAPI (vocabulary list follows)
    AndroidAccessibility
    ARIA
    ATK
    AT-SPI
    BlackberryAccessibility
    iAccessible2
    iOSAccessibility
    JavaAccessibility
    MacOSXAccessibility
    MSAA
    UIAutomation
accessibilityControl (vocabulary list follows)
    fullKeyboardControl
    fullMouseControl
    fullSwitchControl
    fullTouchControl
    fullVideoControl
    fullVoiceControl
accessMode (vocabulary list follows)
    auditory
    chartOnVisual List: 81; Code 19: Figures, Diagrams, Charts
    chemOnVisual
    colorDependent
    diagramOnVisual List: 81; Code 19: Figures, Diagrams, Charts
    mathOnVisual
    musicOnVisual
    tactile
    textOnVisual
    textual List: 81; Code: 10 combined with List: 196; Code: 10 means all text is actual text. Note that List: 81; Code: 10 on its own (without List: 196; Code: 10) admits the possibility that the ‘text’ is inaccessible because it is an image of text.
    visual List: 81; Code: 07: Still images / graphics or Code: 18: Photographs or Code: 19: Figures, diagrams, charts, graphs or Code: 12: Maps and/or other cartographic content
accessModeSufficient (vocabulary list follows) ONIX crosswalks are for instances where accessModeSufficient includes this vocabulary entry alone; combinations may occur but are more difficult to crosswalk
    auditory List: 81; Code:01
    tactile
    textual List: 81; Code: 10 combined with List: 196; Code: 10 means all text is actual text. Note that List: 81; Code: 10 on its own (without List: 196; Code: 10) admits the possibility that the ‘text’ is inaccessible because it is an image of text.
    visual
accessibilitySummary List: 196; Code: 00: Accessibility Summary
    Human-readable text If present, include information from List: 196; Codes 95, 96, 98, and 99 (links for further information about accessibility)

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