I
ran across another community working in the same space as DFDL: BSDL as part of
MPEG21 (someone at the NARA conference mentioned it). From a quick look at what
they have, it appears to be inverse DFDL with plans to make DFDL next, i.e. they
go from model to output binary format, but not vice versa. Similar schema
approach, etc. with some comments on things in schema that they don't allow. I
haven't found a spec doc yet, just a paper and some presentations you can google
for.
Jim