Definition
Indicates that the author has not yet checked if the resource contains accessibility features.
Examples
Example 1 — EPUB 3
<meta property="schema:accessibilityFeature">
unknown
</meta>
Example 2 — EPUB 2
<meta name="schema:accessibilityFeature"
content="unknown"/>
Example 3 — Audiobooks
"accessibilityFeature": ["unknown"]
Explanation
The unknown
value indicates the accessibility features of a publication are not known. Only use this value
when a publication has not been evaluated for accessibility as it is not useful for readers.
Do not use the unknown
value with any other accessibility feature values.
ONIX Mapping
The unknown
value maps to list 196
code 08 ("Unknown accessibility").
Related Links
- Schema.org — accessibilityFeature
- Schema.org Accessibility Vocabulary — unknown