File Format
At this point, we know that a Digital Item can be a complex collection of information. Both still and dynamic media can be included, for example: images and movies; as well as Digital Item information, metadata, layout information, and so on. It can also include both textual data, XML for instance, and binary data, like an MPEG-4 presentation or a still picture.
The MPEG-21 Part 9 specification (ISO/IEC 21000-9) defined the MPEG-21 File Format. It is based on the ISO base media file format and designed to contain a base MPEG-21 XML document with some or all of its ancillary resources, potentially in a single package. It uses filename extension .m21 or .mp21 and MIME type application/mp21.
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Famous quotes containing the word file:
“I have been a soreheaded occupant of a file drawer labeled “Science Fiction” ... and I would like out, particularly since so many serious critics regularly mistake the drawer for a urinal.”
—Kurt Vonnegut, Jr. (b. 1922)