| direct-children | documentation | graph |
| SymbolicString | 78 | The Class of alphanumeric sequences. | ^ |
| Character | 4 | An element of an alphabet, a set of numerals, etc. Note that a Character may or may not be part o... | ^ |
| AlphabeticCharacter | 2 | Any Character that is comprised of a single alphabetical character, e.g. A, B, C, D, ... | ^ |
| DigitCharacter | . | Any Character that is comprised of a single digit, i.e. one of the numerals 0, 1, 2, 3, 4, 5, 6, ... | ^ |
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