Explanation

An auditory sufficient access mode indicates that a publication can be read, in whole or in part, if a user is able to perceive sound. It is expressed in metadata using the auditory value.

A single auditory sufficient access mode is, by design, most commonly associated with audiobooks, but it is also possible for formats like EPUB 3 that provide text and audio synchronization for an entire work to have a solitary auditory sufficient access mode. This is because sufficient access modes take into account any accessibility affordances provided by the publisher.

Note, however, that unlike an auditory access mode, an auditory sufficient access mode is always specified when media overlays are used in an EPUB 3 file to include the full audio of the publication.

The auditory value is more commonly found in combination with textual for works that include auditory clips, whether standalone or when the audio is part of a video.

Note that it is not possible for EPUB 2 publications to have an auditory sufficient access mode as the format does not support embedding audio or have an equivalent to EPUB 3's media overlays.

Examples

Example 1 — EPUB 3
<meta property="schema:accessModeSufficient">textual</meta>
<meta property="schema:accessModeSufficient">auditory</meta>
Example 3 — Audiobooks
"accessModeSufficient": [
   {
      "type": "ItemList",
      "itemListElement": ["auditory"],
      "description": "Audio"
   }
]

ONIX Mapping

ONIX currently does not include a means of expressing sufficient access modes.

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