Hello haskell-prime, i've planned some time ago to open unicode/internalization wiki page, what reflects current state of the art in this area. here is the information i have, please add/correct me if i don't know something or wrong. 1. Char supports full Unicode range (about million of chars) instead of just 8-bit ASCII: implemented in GHC 6.0 and Hugs 2005 (i'm not sure about exact versions) 2. Character classification/convertion routines in Data.Char: all Unicode chars managed properly starting from GHC 6.4 and Hugs 2005. Author of this update, Dmitry Golubovsky, also provides it as additional lib for ghc 6.2.2, and i think it is possible to extend his work to work with any compiler supporting "wide" Chars. 3. Unicode support in I/O routines, i.e. ability to read/write UTF-8 encoded files and files what use other Unicode byte encodings: not implemented in any compiler, afaik, but there are 3rd-party libs: Streams library, New I/O library, and even CharIO module from jhc sources 4. Support for UTF-8 encoded source files: implemented in ghc 6.5 and jhc. afaik, ghc's support is more advanced because it uses abovementioned routines to classify Chars, so you can use any national characters in identifiers according to their case, and all other symbols in operators. because ghc 6.5 supports ONLY utf-8 encoded source files, these creates some problems when compiling files created for previous versions of ghc (or for other compilers) and using ASCII encoding with national (>chr 127) chars in comments and especially string literals. GHC team asked their users for best solution of this problem if i don't mentioned here any issues regarding unicode/internalization, please add this -- Best regards, Bulat mailto:Bulat.Ziganshin@gmail.com