The Timed Text Working Group invites implementations of an updated Candidate Recommendation Snapshot of Dubbing and Audio description Profiles of TTML2. This specification defines DAPT, a TTML-based file format for the exchange of timed text content in transcription and translation workflows used in the production of dubbing scripts, audio description, translation subtitles and hard of hearing subtitles (also known as closed captions).
w3.org/news/2025/updated-candi

Class diagram showing main entities in the DAPT data model.
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