TTML Profiles for Internet Media Subtitles and Captions 1.0.1 (IMSC1) is now a W3C Recommendation

The Timed Text Working Group has published TTML Profiles for Internet Media Subtitles and Captions 1.0.1 (IMSC1) as a W3C Recommendation. 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. It is feasible to create documents that simultaneously conform to both [ttml10-sdp-us] and the text-only profile. The document defines extensions to [TTML1], as well as incorporates extensions specified in [ST2052-1] and [EBU-TT-D]. Both profiles are based on [SUBM].

Comments

Post a Comment

Popular posts from this blog

XML Signature Syntax and Processing Version 2.0 Note Published

23 July 2015 The  XML Security Working Group  has published a Group Note of  XML Signature Syntax and Processing Version 2.0 . This informative W3C Working Group Note describes XML digital signature processing rules and syntax. XML Signatures provide integrity, message authentication, and/or signer authentication services for data of any type, whether located within the XML that includes the signature or elsewhere. Learn more about the  Security Activity . Introduction: Mastering Digital Growth in 2025—From SEO to Social Media and AI In 2025, digital success isn’t just about having an online presence—it’s about strategically connecting the dots between SEO, web design, content creation, and social media. For small businesses and marketers alike, staying ahead means embracing the latest tools and trends that shape how we rank, engage, and grow online. Whether you're aiming to  win local search  with cutting-edge  SEO for Small Business in 2025: H...
Read more

New Online Course: HTML5 Audio and Video

We are pleased to announce the launch of a new W3C online course: HTML5 Audio and Video . Taught by Mark Boas , one of the HTML5 doctors, the course will last 5 weeks, from 17 October to 20 November 2011. Through this course students will learn how to use HTML5 media in Web pages and applications. The full price of the course is €225 but we have a limited number of seats available at the early bird rate of €145, available until 7 October 2011. Register today ! Introduction: Mastering Digital Growth in 2025—From SEO to Social Media and AI In 2025, digital success isn’t just about having an online presence—it’s about strategically connecting the dots between SEO, web design, content creation, and social media. For small businesses and marketers alike, staying ahead means embracing the latest tools and trends that shape how we rank, engage, and grow online. Whether you're aiming to  win local search  with cutting-edge  SEO for Small Business in 2025: How to Win Local Searc...
Read more

Generative Engine Optimization (GEO) in 2026: How to Get Cited in AI Overviews and LLMs

Image
AI search isn’t coming — it’s already here. In 2026, Google AI Overviews, Perplexity, ChatGPT Search, Gemini, and Claude handle billions of queries every month. Users no longer click through blue links; they get synthesized answers with citations. If your content isn’t being cited , you’re invisible. That’s where Generative Engine Optimization (GEO) comes in. Unlike traditional SEO (which fights for rankings in the top 10), GEO focuses on making your content machine-readable, citable, and trustworthy so AI engines pull it directly into their responses. At SEO W3C, we’ve always championed web standards. In 2026, W3C-backed structured data (especially JSON-LD) is your most powerful GEO lever. It turns your pages into clean, verifiable data blocks that LLMs love to cite. Let’s dive deep into exactly how to win citations in AI Overviews and LLMs — with proven 2026 tactics and heavy emphasis on W3C-compliant structured data. What Is Generative Engine Optimization (GEO) — and Why 202...
Read more