transformation format
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... character set.
Although other transformation formats of [UNICODE] exist, and
conceivably can be used on nonet-oriented machines (most notably
...
... four wasted bits per [UNICODE] character. This transformation
format requires complex surrogates to represent codepoints
outside the BMP, and can not represent non-[UNICODE ...
... outside the BMP. When stored in nonets, this results in as
many as sixteen wasted bits per character. This transformation
format requires very complex and computationally expensive
shifting and "modified BASE64" processing, and can not
...
... Goldsmith, D. and M. Davis, "UTF-7 A Mail-Safe Transformation Format of Unicode", RFC 2152, May 1997. ...