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\[PT:...\] some formats (such as application/postscript) have version numbering conventions that are internal to the media format. Where such conventions exist, MIME does nothing to supersede them. Where no such conventions exist, a MIME media type might use a "version" parameter in the content-type field if necessary.
(1) TYPE -- the general type or category of binary data. This is intended as information for the human recipient rather than for any automatic processing.
A charset parameter is be used to indicate the character set of the file for text subtypes. The octet-stream subtype of type application is used to indicate that a body contains arbitrary binary data. One of the optional parameters for this subtype is type which is the general type or category of binary data. This is intended as information for the human recipient rather than for any automatic processing. A codecs parameter is used for audio and video media types to indicate the coder-decoder for encoding analog signals to digital and decoding digital to analog signals [PT:RFC4281, RFC5334].
i.e. you can combine any text encoding with any text type. Using PUIDs means that two separate identiefers are required, and tehre is no scheme fot tying them together. Futhermore, in general, one can imagine schemes where centralised minting is not necessary for every combination etc etc.