[M4IF Discuss] DMIF and Amendment 7

[zze-tdf tvnum MATHUR N ext FTRD/TDF/REN]

Hi,
I'm currently working on a review of technologies that would suit digital television. One of them is the MHP standard, which relies on Java code and MPEG-2 TS, but an enhancement based on MPEG-4 is already being talked about. 
The problem is that I'm a bit confused about the DMIF layer that is introduced in MPEG-4 and the "amendment 7" that specifies how mpeg-4 data may be carried over mpeg-2 TS and PS. 
Do they represent two different visions of how data can be carried in a broadcasting environment, or does "amendment 7" imply the use of DMIF?  
Could someone enlighten me on this point?
Moreover, I'm looking for documents related to actual implementation of mpeg-4 over mpeg-2 and of DMIF. Any suggestion would be welcomed!
Best Regards,
Nivedita MATHUR
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