[ttml2] Add #metadata-version-2 feature designator

skynavga has just created a new issue for https://github.com/w3c/ttml2:

== Add #metadata-version-2 feature designator ==
(as an extension of ``#metadata``) to cover new metadata features added to TTML2, e.g., ``ttm:item`` element and ``@ttm:alt``.

Please view or discuss this issue at https://github.com/w3c/ttml2/issues/491 using your GitHub account

Received on Friday, 10 November 2017 07:29:09 UTC