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.
Read more about this topic: Digital Item
Famous quotes containing the word file:
“While waiting to get married, several forms of employment were acceptable. Teaching kindergarten was for those girls who stayed in school four years. The rest were secretaries, typists, file clerks, or receptionists in insurance firms or banks, preferably those owned or run by the family, but respectable enough if the boss was an upstanding Christian member of the community.”
—Barbara Howar (b. 1934)