Some of the above types require the ability to transport binary data. This is the default encod- ing. 8bit Like 7bit, except that bytes with the high-order bit set may be present. Many transmission paths are incapable of carrying messages which use this encoding. Many transmission paths are incapable of carrying messages which use this encoding.
Line length is limited and EOLs in the encoded form are ignored.
Tabs and blanks may be represented literally if not at the end of a line. The Content-Description header allows further description of a body part, analogous to the use of Subject for messages. Note that most of these headers are structured header fields, as defined in RFC 822. Consequently, comments are allowed in their values. Although the MIME specification was devel- oped for mail, there is nothing precluding its use for news as well.