A New Internet-Draft is available from the on-line Internet-Drafts directories.

Title
The Text/Plain Format and DelSp Parameters
Author
R. Gellens
Filename
draft-gellens-format-bis-04.txt
Expires
April 2004

This specification establishes two parameters to be used with the Text/Plain media type, and, in the presence of these parameters, the use of trailing whitespace to indicate flowed lines. This results in an encoding which appears as normal Text/Plain in older implementations, since it is in fact normal Text/Plain, yet provides for superior wrapping, flowing, and quoting.

This standard supersedes the one specified in RFC 2646, ‘The Text/Plain Format Parameter’, and adds the DelSp parameter to accommodate languages/coded character sets in which ASCII spaces are not used or appear rarely.

http://www.ietf.org/internet-drafts/draft-gellens-format-bis-04.txt