media type
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... value
syntax. This applies even if the specific charset being registered
is not suitable for use with the "text" media type.
...
...
Finally, charsets being registered for use with the "text" media type
MUST have a primary name that conforms to the more restrictive syntax
of the charset ...
... Registration of things
that are better thought of as a transfer encoding, as a media type,
or as a collection of separate entities of another type, is not
allowed. For example, although HTML ...
... HTML could theoretically be thought
of as a charset, it is really better thought of as a media type and
as such it cannot be registered as a charset.
...
... Postel, J., "Media Type Registration Procedure", RFC 1590(-> 2049draft | 2048(-> 4289 | 4288) | 2047draft | 2046draft | 2045draft),March 1994. ...
... Freed, N. and N. Borenstein, "Multipurpose Internet Mail Extensions (MIME) Part Two: Media Types", RFC 2046draft, November 1996. ...