Status of this Document
This document is not subject to semantic versioning. Changes will be tracked within the document.
Editors:
-
Michael Appleby, Yale University
-
Dawn Childress, UCLA
-
Tom Crane, Digirati
-
Jeff Mixter, OCLC
-
Robert Sanderson, Yale University
-
Julie Winchester, Duke University
Copyright © 2012-2026 Editors and contributors. Published by the IIIF Consortium under the CC-BY license, see disclaimer.
Abstract
This document lists a set of allowed values for the Presentation API provides property that have been identified as useful for implementations, especially related to accessibility. They may be defined by the IIIF community, or outside of it.
Please send feedback to iiif-discuss@googlegroups.com
1. Introduction
This is one of a number of IIIF registries. It lists a set of allowed values for the Presentation API provides property that have been identified as useful for implementations, especially related to accessibility. They may be defined by the IIIF community, or outside of it.
1.1. Disclaimer
The inclusion of entries in this document that are outside of the IIIF domain must not be interpreted as endorsement, support, or approval from the editors, the IIIF community or any individual. This annex is provided as a registry to advertise the existence of these extensions and attempt to ensure some consistency between implementations for common but not universal requirements.
1.2. Inclusion Process
The process for having a new entry added to this registry is described here.
2. Requirements for Inclusion
3. Registry
This table summarizes the known values available for use with the Presentation API provides propery, which defines accessibility functionality that a linked resource enables for its target, describing why and how a client might use it rather than what the resource is by type or format. The current approved values are defined by Schema.org’s Accessibility Properties for Discoverability Vocabulary and the IIIF Community.
| Value | Description | Source |
|---|---|---|
closedCaptions |
… | Schema.org |
alternativeText |
… | Schema.org |
audioDescription |
… | Schema.org |
longDescription |
… | Schema.org |
signLanguage |
… | Schema.org |
highContrastAudio |
… | Schema.org |
highContrastDisplay |
… | Schema.org |
braille |
… | Schema.org |
tactileGraphic |
… | Schema.org |
transcript |
… | Schema.org |
translation |
… | IIIF |
subtitles |
… | IIIF |
Appendices
A. Acknowledgements
Thanks to the members of the IIIF for their continuous engagement, innovative ideas and feedback.
B. Change Log
| Date | Description |
|---|---|
| 2026-XX-YY | New Version 4 Registries |