A specialization of AbstractInformationStructure. Each instance of CharacterString is a string of characters or an abstract sequence of symbols. Note that an instance of CharacterString is not any particular physical, tangible representation, since different encodings may represent the same string of characters. An instance of CharacterString is a list (see the collection List) of characters (instances of Character_Abstract) from some fixed character set. An instance of CharacterString may be any finite length, including zero (the zero-length string is the empty string, which has no characters). Notable specializations of CharacterString include EMailAddress, AreaCode, PhoneNumber, and TelephoneCountryCode. Note that a CharacterString is ordered formally as a List (rather than physically left-to-right or top-to-bottom); thus the 'first' character in the CharacterString for an Arabic word happens to be the rightmost (first pronounced) character, not the leftmost character, due to the letter-order and word-order convention for Arabic writing.
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