Re: Survey ready on Media Multitrack API proposal

On the multi-track issue:

> I agree, but think that the "nice feature" is the possibility of having parallel text tracks, while having mutually exclusive tracks is absolutely fundamental. If we can't handle grouping in a nice way we can discard it and require scripts to achieve parallel text tracks. But let's finish this in the HTML WG.

I would continue to argue that two separate concepts are being mixed here:
1. a general mechanism for selecting alternative forms of content (or 
structure), and
2. a synchronization mechanism that allows 0, 1, or more elements to be 
displayed at the same time.

The first (which SMIL handles as <switch> and which is being reinvented 
here as <trackgroup>) should be totally decoupled from the second (which 
SMIL handles as <par>,<seq> and <excl>). It will make your life -- and 
that of authors -- much easier in the future.

-d.