New TTML2 WD for Review

A new WD for TTML2 is ready for review at [1]. It passes pubrules, with
only the following, which is expected and not in error. The first of the
URIs below is not a namespace URI. The second is a link to the yet to be
published WD. The date will need to be updated for the publishing target
date.

[1] http://rawgit.com/w3c/ttml2/master/spec/ttml2.html

All proposed XML namespaces
<http://www.w3.org/TR/1999/REC-xml-names-19990114/> created by the
publication of the document must follow URIs for W3C Namespaces
<http://www.w3.org/2005/07/13-nsuri>.
Error The Namespaces Checker
<http://www.w3.org/2003/09/nschecker?uri=http://rawgit.com/w3c/ttml2/master/spec/ttml2.html>
was
used for this test. The following is a list of URIs that *might* be
(broken) namespace URIs. Note: If they are not namespace URIs, please just
let the Webmaster know in your publication request.
http://www.smpte-ra.org/schemas/2052-1/2013/smpte-tt#cea608 (1 occurrence)
-> 301 (Moved Permanently) -> 404 (Not Found)
http://www.w3.org/TR/2016/WD-ttml2-20160502/ (1 occurrence)-> 404 (Not Found
)