Perl 5.7.3 and later ships with an adequate set of Chinese encodings,
including the commonly used 'CP950', 'CP936' (also known as 'GBK'), 'Big5'
(alias for 'Big5-Eten'), 'Big5-HKSCS', 'EUC-CN', 'HZ', and 'ISO-IR-165'.

However, the numbers of Chinese encodings are staggering, and a complete
coverage will easily increase the size of perl distribution by several
megabytes; hence, this CPAN module tries to provide the rest of them.

If you are using Perl 5.8 or later, the Encode::CN manpage and the
Encode::TW manpage will automatically load the extra encodings for you, so
there's no need to explicitly write 'use Encode::HanExtra' if you are using
one of them already.