MIME - Base Content Types
text
- subtypes: plain (just ASCII) and richtext (a simple markup extension including <bold>, <italic> etc. tags)
- character sets can be further specified in the header value field as follows:
- Content-type: text/plain; charset=us-ascii
- 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.
image
- Standard subtypes: gif, jpeg. Others expected.
audio
- Standard subtype: single-channel 8KHz u-law. Others expected.
video
- Standard subtype: mpeg. Others plausible.