Re: TTML2/TTML1 Backwards compatibility analysis

I added references to the following TTML1 issues from TTML2 #358
<https://github.com/w3c/ttml2/issues/358>. As I process each of them, I
will reply to each of your specific comments as required.


   -       w3c/ttml1/#201 <https://github.com/w3c/ttml1/issues/201> agent
   and actor references

 w3c/ttml1/#204 <https://github.com/w3c/ttml1/issues/204> generic family
name
 w3c/ttml1/#207 <https://github.com/w3c/ttml1/issues/207> visibility hidden
 w3c/ttml1/#212 <https://github.com/w3c/ttml1/issues/212> content bpd
 w3c/ttml1/#214 <https://github.com/w3c/ttml1/issues/214> font size using
'em' unit
 w3c/ttml1/#235 <https://github.com/w3c/ttml1/issues/235> tab processing
 w3c/ttml1/#239 <https://github.com/w3c/ttml1/issues/239> region overflow
semantics
 w3c/ttml1/#241 <https://github.com/w3c/ttml1/issues/241> z index auto

On Fri, Nov 3, 2017 at 6:20 PM, Cyril Concolato <cconcolato@netflix.com>
wrote:

> Glenn,
>
> I'm fine with that. Can you respond to my comments in the TTML1 issues?
> I'll check each of them and add them to #358 if necessary.
>
> Cyril
>
> On Fri, Nov 3, 2017 at 4:13 PM, Glenn Adams <glenn@skynav.com> wrote:
>
>> Since we already have an umbrella issue in TTML2 to handle incorporating
>> fixes from TTML1 work, we can just add new sub-items to #358
>> <https://github.com/w3c/ttml2/issues/358> to handle this (instead of
>> adding a bunch of new TTML2 issues).
>>
>> On Fri, Nov 3, 2017 at 3:06 PM, Cyril Concolato <cconcolato@netflix.com>
>> wrote:
>>
>>> Hi all,
>>>
>>> Just a quick message to let you know that I went through all TTML1 open
>>> issues [2] to check if they had any impact on the compatibility between
>>> TTML1 and TTML2. I have added comments to the issues for which I couldn't
>>> tell if it had an impact or not. Otherwise, I have updated the Google doc
>>> [1], mostly adding links. I did not find new incompatibilities (pending
>>> responses in open issues).
>>>
>>> I did not add to the Wiki because it's hard to convert it to a wiki
>>> format. Anyone knows a converter from Gdoc to Wiki?
>>>
>>> Cyril
>>>
>>> [1] https://docs.google.com/document/d/1Ri7RBBsbIK9SRxA1KsHR
>>> ejXbYBuL4CRRrbmEZRbwZpg/edit#
>>> [2] https://github.com/w3c/ttml1/issues
>>>
>>> On Fri, Oct 13, 2017 at 4:09 PM, Cyril Concolato <cconcolato@netflix.com
>>> > wrote:
>>>
>>>> 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/1Ri7RBBsbIK9SRxA1KsHRejXb
>>>> YBuL4CRRrbmEZRbwZpg/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
>>>>
>>>>
>>>>
>>>
>>
>