This International Standard specifies the MPEG-21 file format, in which an MPEG-21 XML document (e.g. Digital Item Declaration (DID)) and some or all of its referenced content can be placed in a single 'content package' file. This enables the interchange, editing, and 'playback' of MPEG-21 documents.
ISO/IEC 21000-9:2005 history
2008ISO/IEC 21000-9:2005/Amd 1:2008 Amendment 1 - Information technology -- Multimedia framework (MPEG-21) -- Part 9: File Format - MIME type registration
2005ISO/IEC 21000-9:2005 Information technology - Multimedia framework (MPEG-21) - Part 9: File Format