[MPEG-OTSPEC] Copy of previous document plus DMAP idea

[Skef Iterum]

The previous draft of the "New feature variations" document is attached. 
The sections on the specific implementation in this draft are now out of 
date -- refer to the newer draft for those specifics. However, this 
earlier draft also has the explanatory material referenced in the last 
meeting, particularly concerning the scaling problems with the current 
system and a specific example comparison of the two.

Now, on DMAP and the lack of specifics about other formats ...

Just as a starting point for discussion, suppose the convention was:

 1. Formats 4, 12, ? work as described in the current draft
 2. For all other formats, if there is a cmap subtable of that format
    but no DMAP, the cmap table is used and any implicit or explicit
    references to other formats refer only to the content in cmap, never
    to dmapl

    If there are cmap and DMAP subtables of that format, or just a DMAP
    subtable, the DMAP subtable is used and the cmap table (if any) is
    ignored. Any implicit or explicit references to other formats are to
    the DMAP table (if not format 4, 12, ?) or to the combination of the
    DMAP and cmap tables (if format 4, 12, ?).

This is a relatively simple convention and probably fine for any 
subtable format not likely to be large. So: would people be happy with 
this, or are there other formats likely to be large enough to optimize 
for, and how should sharing be defined for those?

Skef
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