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39.12.2 Character Set Data Type

The data type charset implements sets of characters (see Characters). Because the internal representation of character sets is not visible to the user, a lot of procedures for handling them are provided.

Character sets can be created, extended, tested for the membership of a characters and be compared to other character sets.

The Guile implementation of character sets deals with 8-bit characters. In the standard variables, only the ASCII part of the character range is really used, so that for example Umlaute and other accented characters are not considered to be letters. In the future, as Guile may get support for international character sets, this will change, so don't rely on these "features".