Log Message:
Import hs-hxt-unicode-9.0.1 as wip/hs-hxt-unicode.

Unicode encoding and decoding functions for utf8, iso-latin-* and
somes other encodings, used in the Haskell XML Toolbox. ISO Latin 1 -
16, utf8, utf16, ASCII are supported. Decoding is done with lasy
functions, errors may be detected or ignored.