[M4IF Technotes] iods & 3GPP

[emre.aksu nokia.com]

Hi Giuliano,
According to section 9.2.4 in TS.26.234 Rel.4 document:
.........
9.2.4 MPEG-4 systems specific elements
"Tracks relative to MPEG-4 system architectural elements (e.g. BIFS scene description tracks or OD Object descriptors) are optional and shall be ignored. The adoption of the MPEG-4 file format does not imply the usage of MPEG-4 systems architecture. The receiving terminal is not required to implement any of the specific MPEG-4 system architectural elements."
.........
Hence, iods atom is not mandated in a 3GP file, and it shall be ignored in a file that addresses 3GP file compliance according to TS.26.234 Rel.4 and beyond. 
I also think that iods is not a part of ISO File format, but the MPEG-4 Specific file format which is inherited from ISO file format. 3GP file format is inherited from the ISO file format, which definitely makes the distinction between MPEG-4 systems related elements, and the core file format template (i.e. ISO).
Best Regards,
Emre
Emre Baris Aksu
Nokia Corp.
-----Original Message-----
From: ext Catrambone Giuliano [mailto:Giuliano.Catrambone   h3g.it]
Sent: 03. September 2002 17:46
To: technotes   lists.m4if.org
Subject: [M4IF Technotes] iods & 3GPP
Hi,
    I know that the iods atom is mandatory in ISO spec.
    Do you know if the iods atom is mandatory in the 3GPP?
        giuliano