lib/rnrs/unicode.ss
 (library (rnrs unicode (6))
   (export char-upcase char-downcase char-titlecase char-foldcase	
	   char-ci=? char-ci<? char-ci>? char-ci<=? char-ci>=? 
	   char-alphabetic? char-numeric? char-whitespace? char-upper-case? char-lower-case? 
	   char-general-category
	   
	   string-upcase string-downcase string-titlecase string-foldcase
	   string-ci=? string-ci<? string-ci>? string-ci<=? string-ci>=?
	   string-normalize-nfd string-normalize-nfkd string-normalize-nfc string-normalize-nfkc)
   (import (core primitives)))