The m17n library
 
  A general purpose multilingual text processing library.
      m17n-lib: Language/script independent C library.
      m17n-db: External database for language/script dependent information.
             charset mappings, character properties, input methods, etc.
 
  Font Layout Table
      One of the database in m17n-db
      Format to represent knowledge for CTL
             Compact and simple rules
             Perform CTL by cascaded stages