text
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subtypes: plain (just ASCII) and richtext (a simple markup extension including <bold>, <italic> etc. tags)
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character sets can be further specified in the header value field as follows:
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Content-type: text/plain; charset=us-ascii
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Other charsets can be used to support other languages such as iso-8859-1 (French) or iso-2022-JP (Japanese). These charsets need to be encoded in one of two encoding modes: base64 or quoted-printable. The latter retains ASCII subset and is more natural for non-ASCII extensions.
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image
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Standard subtypes: gif, jpeg. Others expected.
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base64 is a natural encoding scheme for binary media - it packs three 8-bit chars into four 7-bit chars.
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audio
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Standard subtype: single-channel 8KHz u-law. Others expected.
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video
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Standard subtype: mpeg. Others plausible.
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