The raw MIME Type is only have limited value, since there could be text/plain;charset=UTF-8 or text/plain;ISO-8859-1 and we usually do not care about the distinction.
Note that lower level fields may sometimes be needed to compute
more useful fields. Also, sometimes the higher level fields may be more difficult
to compute, so they are not always worth it.
MIME Type is automatically captured by Chimera.