While the work on the specification began here, it has moved to the W3C schema.org page and the Accessibility Metadata public page. You should go to each of those for the current state. We've left it here just for historical purposes...it contains the version history of our development. But for active content, V.6 and beyond, go to the other two places.
A majority of properties and terms below are a subset derived from the IMS Global Learning Consortium's Access for All specification. Included with permission from the IMS Global Learning Consortium for use by schema.org.
| An access mode through which the intellectual content of a described resource or adaptation is communicated; if adaptations for the resource are known, the access modes of those adaptations are not included.
These derive primarily from AfA AccessModeRequired.Type/existingAccessMode.
| Accessible content features included with the resource.
These derive primarily from AfA AdaptationTypeRequired.Type/adaptationRequest. Also, note the comment below about BookFormat and how it takes on the role that e-book had in AfA.
|hasAdaptation||URL||URI||Identifier of a resource that is an adaptation for this resource.|
|isAdaptationOf||URL||URI|| Identifier of a resource for which this is an adaptation.
| Indicates that the resource is compatible with the referenced accessibility API.
These derive from AfA apiInteroperable.
|ATCompatible||Boolean||Boolean||The resource is compatible with assistive technologies. For example, that the resource complies to WCAG 2.0 checkpoints: 1.1.1, 1.3.1, 1.3.2, 2.4.4, 3.1.1, 3.1.2, 3.3.2, 4.1.1, 4.1.2.|
|displayTransformability||Text||css|| Identifies modifiable display characteristics of the described resource.
|Identifies a single input method that is sufficient to control the described resource.|
|A characteristic of the described resource that is physiologically dangerous to some users.|
This proposal also requests the expansion of the bookFormatType enumeration to include the following formats:
- educationalComplexityOfAdaptation – this may be covered through LRMI educationalAlignment/textComplexity
- educationalLevelOfAdaptation – covered by LRMI typicalAgeRange
- languageOfAdaptation – covered by inLanguage in CreativeWork of schema.org and/or HTML language attributes
- caption, transcript - covered by these properties in VideoObject of schema.org (note, however, that these properties are just text strings, not URI resources)
- accessibility ratings can be done by subclassing the Ratings class of CreativeWork of schema.org
- operatingSystem can be used to complement accessAPI by indicating known O/S compatibility
- bookFormat can be used to indicate the format of the resource (e.g., e-book, large print, braille, etc.). The enumeration of format types will need to be extended within this property of Book. There are examples of this in the APH example.
To focus the proposal on simple web discovery, the following properties will not be included: