Hello, I'd like to inform you that we've defined the MIME type application/ mp21 as part of ISO/IEC 21000-9:2005/Amd.1:2008 (File format of the MPEG-21 Multimedia Framework). The MIME type definition is publicly available at the following address and also below for your convenience. Annex D of ISO/IEC 21000-9:2005: http://standards.iso.org/ittf/PubliclyAvailableStandards/c050551_ISOIEC_2100... F. A. S. site: http://standards.iso.org/ittf/PubliclyAvailableStandards/index.html I would appreciate if this could be included as a mime type at http://www.iana.org/assignments/media-types/application/ . In case you have any questions, please do not hesitate to contact me. Thank you. Best regards, -Christian (editor of ISO/IEC 21000-9:2005/Amd.1:2008) The text from http://standards.iso.org/ittf/PubliclyAvailableStandards/c050551_ISOIEC_2100... MIME media type name: application MIME subtype name: mp21 Required parameters: none Optional parameters: none Encoding considerations: base64 is generally preferred; files are binary and should be transmitted without CR/LF conversion, 7-bit stripping, etc. Note that although files conforming to ISO/IEC 21000-2 are textual XML the mp21 file which contains it is binary. Security considerations: It is possible to inject non-compliant MPEG streams (Audio, Video, and Systems) in the MP21 file to overload the receiver/decoder's buffers. This might compromise the functionality of the receiver or even crash it. An MP21 file supports the storage of stream types, including commands that are executed on the terminal such as Digital Item Methods based on ECMASCRIPT for which also bindings to Java(TM) and C++ exists. It is possible to use one or more of the above in a manner non- compliant to MPEG to crash the receiver or temporarily make it unavailable. Authentication mechanisms can be used to validate of the sender and the data to prevent security problems due to non-compliant malignant MP21 files. Interoperability considerations: A number of interoperating implementations exist within the ISO/IEC 21000 community, and that community has reference software for reading and writing the file format. Published specification: ISO/IEC 21000-9:2005 Applications which use this media type: Multimedia Additional information: Magic number(s): none File extension(s): m21 and mp21 are both declared at http://www.fileinfo.net and http://filext.com/. Macintosh File Type Code(s): mp21 is registered with Apple. Person & email address to contact for further information: David Singer, singer@apple.com Intended usage: COMMON Author/Change controller: David Singer, ISO/IEC 21000 file format chair