Re: TTML2 Diff Feature Count

Thanks for the clarification Glenn.

Cyril

On Thu, Aug 9, 2018 at 2:08 PM Glenn Adams <glenn@skynav.com> wrote:

> During today's call, I mentioned there were 135 new features in TTML2 (as
> compared with TTML1). Cyril asked why this was different from the 255 - 114
> = 141 count one gets when comparing TTML2 E.1 subsections with TTML1 D.1
> subsections.
>
> The reason for the discrepancy is that there are 6 new feature designators
> in TTML2 used to label technical features already present in TTML1, but for
> which TTML1 did not define feature designator labels. These six new feature
> designators are:
>
> #base                   included in TTML1 #profile (*)
> #displayAlign-region    included in TTML1 #displayAlign
> #displayAlign-relative  included in TTML1 #displayAlign
> #extent-auto            included in TTML1 #extent
> #extent-length          included in TTML1 #extent
> #set                    equivalent to TTML1 #animation
>
> In the case of #base, xml:base is supported in TTML1 only on ttp:features
> and ttp:extensions which are covered by TTML1 #profile.
>
> So, we get 135 (new labels, new features) + 6 (new labels, old features) =
> 141 (new labels).
>
>