RFC 4042 on UTF-9 and UTF-18 Efficient Transformation Formats of Unicode

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         RFC 4042

         Title:      UTF-9 and UTF-18 Efficient Transformation Formats
                     of Unicode
         Author(s):  M. Crispin
         Status:     Informational
         Date:       1 April 2005
         Mailbox:    UTF9@Lingling.Panda.COM
         Pages:      9
         Characters: 19123
         Updates/Obsoletes/SeeAlso:    None


        URL:        ftp://ftp.rfc-editor.org/in-notes/rfc4042.txt


ISO-10646 defines a large character set called the Universal
Character Set (UCS), which encompasses most of the world's writing
systems.  The same set of codepoints is defined by Unicode, which
further defines additional character properties and other
implementation details.  By policy of the relevant standardization
committees, changes to Unicode and amendments and additions to
ISO/IEC 646 track each other, so that the character repertoires and
code point assignments remain in synchronization.

The current representation formats for Unicode (UTF-7, UTF-8, UTF-16)
are not storage and computation efficient on platforms that utilize
the 9 bit nonet as a natural storage unit instead of the 8 bit octet.

This document describes a transformation format of Unicode that takes
advantage of the nonet so that the format will be storage and
computation efficient.

This memo provides information for the Internet community.  It does
not specify an Internet standard of any kind.  Distribution of this
memo is unlimited.

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Joyce K. Reynolds and Sandy Ginoza
USC/Information Sciences Institute

...

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