2017-07-12 12:32:12 UTC
The W3C Timed Text Working Group has recently published a new working
draft of the Timed Text Markup Language 2 (TTML2).
TTML2, provides a standardized representation of a particular subset of
textual information with which stylistic, layout, and timing semantics
are associated by an author or an authoring system for the purpose of
interchange and processing.
In addition to being used for interchange among legacy distribution
content formats, TTML Content may be used directly as a distribution
format, providing, for example, a standard content format to reference
from a <track> element in an HTML5 document, or a <text> or <textstream>
media element in a [SMIL 3.0] document.
The TTML2 specification updates the TTML1 specification by adding
vocabulary and semantics to address more of its core requirements,
including the addition of support for:
raster images (both foreground and background)
author supplied fonts
audio descriptions and text to speech
ruby text annotations
improved vertical line layout
text emphasis, kerning, letter spacing, shadows, and variants
inline block layout
stereoscopic presentation (for 3-D viewing)
high definition resolution (HDR) presentation
conditional element semantics
improved metadata extensibility
formalized intermediate document syntax
various other improvements and bug fixes
The TTWG invites you to review this draft, and requests comments to be
received by 30 Sept 2017. These comments will be used to fulfill the
W3C Process  requirement for Wide Review of drafts, and Horizontal
Review  prior to publication as Candidate Recommendation.
If you wish to make comments regarding this document, please send them
to email@example.com <mailto:firstname.lastname@example.org?subject=%5Bttml%5B> with
[ttml2] at the start of your email's subject. All comments are welcome,
however the scope of review will be mainly focused on the new features
introduced in TTML2.
A cumulative summary of all changes applied to this version since the
current (TTML1, 2nd Edition) Recommendation was published is available
for your convenience .
 TTML2 latest version https://www.w3.org/TR/ttml2/
 TTML1 Recommendation https://www.w3.org/TR/ttml1/
 W3C Process https://www.w3.org/2017/Process-20170301/
 Horizontal Review
On behalf of Nigel Megitt, co-Chair, W3C Timed Text Working Group
Thierry Michel, Staff Contact for TTWG.