[ttml2] TTML2 Wide Review: Make backward compatability normative

tairt has just created a new issue for https://github.com/w3c/ttml2:

== TTML2 Wide Review: Make backward compatability normative  ==
Section 3.4.2 

> A conforming TTML1 content document instance is intended to be a conforming TTML2 content document instance.
A conforming TTML2 processor should be able to process a TTML1 content document instance; however, it may emit warnings if it encounters deprecated features.

Should be changed to

"A conforming TTML1 content document instance **is a** conforming TTML2 content document instance.

A conforming TTML2 processor **must** be able to process a TTML1 content document instance; however, a **validating processor** may emit warnings if it encounters deprecated features."

Please view or discuss this issue at https://github.com/w3c/ttml2/issues/442 using your GitHub account

Received on Saturday, 30 September 2017 14:43:54 UTC