February 27th, 2018
The Timed Text Working Group has published a Proposed Recommendation of TTML Profiles for Internet Media Subtitles and Captions 1.0.1 (IMSC1). This document specifies two profiles of [TTML1]: a text-only profile and an image-only profile. These profiles are intended to be used across subtitle and caption delivery applications worldwide, thereby simplifying interoperability, consistent rendering and conversion to other subtitling and captioning formats.
Comments are welcome through 27 March 2018.