??? Make the name list and alias lists case sensitive.  RT 92680

Add regional codes including:
   MARC:  http://www.loc.gov/marc/countries/   Jarkko Hietaniemi

=========

http://tools.ietf.org/html/rfc5646
language tags (i.e. language [-script] [-region] [-variant]* [-extension]* [-privateuse]
   language :
     x-*
     i-*
     alpha-2 language code
     alpha-3 language code
     qaa-qtz-*
   region :
     alpha-2 country code
     UN M.49 code

Type: region   ISO 3166-1, UN M.49

=========

Create a new package:  Locale-Codes-Links
   links codes of one type to another
      NOT necessarily 1-to-1
   function:
      link(TYPE1 [CODESET1 [CODE1]] TYPE2 [CODESET2 [CODE2]])
         => ( LINK1, LINK2, ...)     all links between types

   TYPE = Language, Script, ...
   LINK = [ CODESET1,CODE1, CODESET2,CODE2 ]

   If all 6 pieces of information are given, returns 1 if the link exists.

   Locale::Codes::Links::Language-ExtLanguage
      links ExtLanguage to Language

Based on RT-61345:

   Add support for language subtags:
      http://www.iana.org/assignments/language-subtag-registry
      http://www.w3.org/International/articles/language-tags/