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Epub
Epub is Publication Type in Thoth.
Epub is an ebook file format published by the International Digital Publishing Forum. It is supported by a variety of e-readers. The most recent release is Epub 3.2.
EPUB Accessibility 1.1 addresses two key needs in the EPUB ecosystem:
evaluation and certification of accessible EPUB Publications; discovery of the accessible qualities of EPUB Publications. This specification sets formal requirements to meet to certify content as accessible, and provides Authors a clear set of guidelines to evaluate their content against, and allow certification of quality. It is designed to be applicable to EPUB Publications that conform to any version or profile, including future versions of the standard.
An EPUB Publication must meet the following criteria to be accessible per this specification:
It must meet the requirements for Discoverable EPUB Publications, including providing metadata on accessibility. It must meet the requirements for [WCAG 2.0] conformance defined in WCAG Conformance Requirements. This specifies WCAG 2.0 A as mandatory, and AA as recommended. It must meet the requirements for EPUB Publications defined in EPUB Requirements. This section covers providing navigation to static page break locations and synchronised text and audio playback. It must include accessibility conformance metadata as defined in Conformance Reporting. This includes stating which WCAG level (A, AA, AAA) it conforms to, and who provided this certification. EPUB publications MUST include the following accessibility metadata:
accessMode — a human sensory perceptual system or cognitive faculty necessary to process or perceive the content (e.g., textual, visual, auditory, tactile).
accessibilityFeature — features and adaptations that contribute to the overall accessibility of the content (e.g., alternative text, extended descriptions, captions).
accessibilityHazard — any potential hazards that the content presents (e.g., flashing, motion simulation, sound).
EPUB publications SHOULD include the following [schema-org] accessibility metadata:
accessibilitySummary — a human-readable summary of the accessibility that complements, but does not duplicate, the other discoverability metadata. The summary also describes any known deficiencies (e.g., lack of extended descriptions, specific hazards).
accessModeSufficient — a set of one or more access modes sufficient to consume the content without significant loss of information. An EPUB publication can have more than one set of sufficient access modes for its consumption depending on the types of content it includes (i.e., unlike access modes, this property takes into account any alternatives for content that is not broadly accessible, such as the inclusion of transcripts for audio content).
EPUB creators MAY include additional [schema-org] accessibility metadata not specified in this section.
There is some companion guidance on Fixed Layout EPUBs.
The Thoth Wiki has been developed in the context of the COPIM (Community-led Open Publication Infrastructures for Monographs) project. Individual contributions to the wiki have been made by Tim Elfenbein, Joanne Fitzpatrick, Rupert Gatti, Ross Higman, Hannah Hillen, Brendan O'Connell, Tobias Steiner, and Vincent W.J. van Gerven Oei under the general editorship of Van Gerven Oei. All data are available under a CC-BY 4.0 license.