4.12 Character Sets
Character sets are another composite data type, like strings, built upon the character data type. A character set is a mathematical set of characters with the most important attribute being membership. That is, a character is either a member of a set or it is not a member of a set. The concept of sequence (for example, whether one character comes before another, as in a string) doesn't apply to character sets. Also, membership is a binary relation; a character is either in the set or it is not in the set; you cannot have multiple copies of the same character in a character set. Various operations are possible on character sets, including the mathematical set operations of union, intersection, difference, and membership test. ...
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