[ttml2] Is ttp:version="2" required if ttp:contentProfiles is present?

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

== Is ttp:version="2" required if ttp:contentProfiles is present?  ==
TTML2 specifies that:

_a ttp:version attribute must be specified on the root tt element of a document instance if it requires support for a feature not defined by [TTML1]._

Is this a processor or document requirement, and what does "require" mean? Specifically, does the mere presence of the `ttp:contentProfiles` attribute in an otherwise TTML1 conformant document trigger the need for `ttp:version="2"`.

I do not think so, but just confirming.

Please view or discuss this issue at https://github.com/w3c/ttml2/issues/435 using your GitHub account

Received on Friday, 29 September 2017 16:53:11 UTC