Re: TTML2/TTML1 Backwards compatibility analysis

Thanks Cyril,

I think it's very useful to focus on the concrete differences rather than the abstract – we may find that we can resolve them.

I've added this (practical compatibility issues between TTML1 and TTML2) to Thursday's agenda.

The URL in your email had an error in: the correct one should be <https://docs..google.com/document/d/1Ri7RBBsbIK9SRxA1KsHRejXbYBuL4CRRrbmEZRbwZpg/edit?usp=sharing> https://docs.google.com/document/d/1Ri7RBBsbIK9SRxA1KsHRejXbYBuL4CRRrbmEZRbwZpg/edit?usp=sharing


In the meantime if everyone interested in this could look at the document and comment/edit it etc that would be very helpful.

Kind regards,

Nigel


From: Cyril Concolato <cconcolato@netflix.com<mailto:cconcolato@netflix.com>>
Date: Saturday, 14 October 2017 at 01:09
To: "public-tt@w3.org<mailto:public-tt@w3.org>" <public-tt@w3.org<mailto:public-tt@w3.org>>
Subject: TTML2/TTML1 Backwards compatibility analysis
Resent-From: <public-tt@w3.org<mailto:public-tt@w3.org>>
Resent-Date: Saturday, 14 October 2017 at 01:11

Hi all,

Following yesterday's call, I started an analysis of the possible backwards compatibility issues of TTML2 vs TTML1. The results are here:
https://docs.google.com/document/d/1Ri7RBBsbIK9SRxA1KsHRejXbYBuL4CRRrbmEZRbwZpg/edit?usp=sharing<https://docs..google.com/document/d/1Ri7RBBsbIK9SRxA1KsHRejXbYBuL4CRRrbmEZRbwZpg/edit?usp=sharing>

This is my analysis, and it might contain errors, oversights. If it is the case, feel free to comment on it.

With the current status, it looks to me that there is no real backwards compatibility issue, in the sense that a TTML2 processor would produce a result, when processing a TTML1 document, that would be acceptable with what the TTML1 spec indicates.

HTH,
Cyril





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