[imsc] Replacing references from TTML1 to TTML2

palemieux has just created a new issue for https://github.com/w3c/imsc:

== Replacing references from TTML1 to TTML2 ==
>From Mike Dolan:

Given the W3C practice of copying provisions in version N rather than normatively referencing version N-1, the opportunity for incompatibility is pretty moderate.  So, changing all references from TTML1 to TTML2 is a pretty risky thing to do in a new profile where we intend that it be compatible with version N-1, specifically such that IMSCvNext rendering results in the same output as from IMSC1.0.1.  Unless there is a conscious intent to extend a TTML1 feature in TTML2 it would be a lot safer to reference TTML1 for all the features found in IMSC1.0.1 and only reference TTML2 for new features or features that were intentionally extended in a backwards compatible manner.

Please view or discuss this issue at https://github.com/w3c/imsc/issues/258 using your GitHub account

Received on Thursday, 5 October 2017 14:14:42 UTC