Internationalization
Use Unicode inside your program. Do any translation to and from other character sets at your interfaces to the outside world. See Chapter 15.
Outside the world of Unicode, you should assume little about
character sets and nothing about the ord values of
characters. Do not assume that the alphabetic characters have
sequential ord values. The lowercase letters may
come before or after the uppercase letters; the lowercase and
uppercase may be interlaced so that both a and
A come before b; the accented
and other international characters may be interlaced so that
ä comes before b.
If your program is to operate on a POSIX system (a rather large assumption), consult the perllocale manpage for more information about POSIX locales. Locales affect character sets and encodings, and date and time formatting, among other things. Proper use of locales will make your program a little bit more portable, or at least more convenient and native-friendly for non-English users. But be aware that locales and Unicode don't mix well yet.
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