New Change Proposal 28 on IMSC 1: Profile refactoring

I’ve added a new Change Proposal to resolve issue-307, issue-315, issue-319 and assist with issue-332:

Change Proposal 28,
Priority 2 (for LC),
Product IMSC 1
Title “Profile refactoring”
URL: https://www.w3.org/wiki/TTML/changeProposal028

Summary: IMSC 1 currently defines two profiles, a Text and an Image profile, both of which include the requirement to meet the complexity constraints expressed in the HRM. This proposal is to factor out the complexity constraints from the content profiles, while providing a clearly identifiable profile that continues to match what implementors of, say, CFF-TT, have already built. A third profile not constrained in complexity is proposed.

Nigel