Explanation

A textual sufficient access mode indicates that a publication can be read, in whole or in part, if the user has a device that can present text character data in a form they can read. This could be as visual text for sighted readers, or as text-to-speech playback or refreshable braille for non-visual readers. It is expressed in metadata using the textual value.

Any accessibility affordances provided by the author are considered when determining when to specify a single textual sufficient access is available. For example, a publication might have textual and visual access modes if it contains a combination of text and images, but the publisher can state that there is a single sufficient textual means of reading the content if the images all have alternative text and/or extended descriptions that fully convey their meaning.

Similarly, text equivalents, like transcripts, provided for auditory content are considered when determining if a publication can be read in full using only text character data.

Although a single textual sufficient access mode is generally the most important for users to be aware of, because it allows the content to be read in a variety of different ways, always include any other combinations of sufficient access modes that include textual content, especially if the access modes are not listed.

For example, an EPUB 3 publication with both textual and visual content that also has a single textual access mode would list the following possibilities:

<meta property="schema:accessModeSufficient">textual, visual</meta>
<meta property="schema:accessModeSufficient">textual</meta>

A single textual sufficient access mode is common in accessible publications produced using the EPUB format but would never apply to an audiobook.

Examples

Example 1 — EPUB 3
<meta property="schema:accessModeSufficient">textual,visual</meta>
<meta property="schema:accessModeSufficient">textual</meta>
Example 2 — EPUB 2
<meta name="schema:accessModeSufficient" content="textual,visual"/>
<meta name="schema:accessModeSufficient" content="textual"/>
Example 3 — Audiobooks
"accessModeSufficient": [
   {
      "type": "ItemList",
      "itemListElement": ["auditory", "textual"],
      "description": "Audio and text"
   }
]

ONIX Mapping

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

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