I sent the proposal as a response to what I thought was the task I
took on at the last IETF. I didn't propose any changes to the DTD,
because I didn't know enough to do so safely.
I intended that what I wrote wouldn't make any additional requirements
on either HTML writers or HTML interpreting applications, but rather,
give a way to describe current practice.
At this point, it's now up to the document editors, I think, to
integrate the proposed changes or reject them, if they aren't seen as
representing the consensus of the group.