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ANSI Common Lisp  13 Characters 13.1 Character Concepts
13.1.4 Character Categories
There are several (overlapping) categories of characters that have no formally
associated type but that are nevertheless useful to name.
They include
graphic characters,
alphabetic1 characters,
characters with case
(uppercase and lowercase characters),
numeric characters,
alphanumeric characters,
and digits (in a given radix).
For each implementation-defined attribute of a character,
the documentation for that implementation must specify whether
characters that differ only in that attribute are permitted to differ
in whether are not they are members of one of the aforementioned categories.
Note that these terms are defined independently of any special syntax
which might have been enabled in the current readtable.
13.1.4.1 Graphic Characters
13.1.4.2 Alphabetic Characters
13.1.4.3 Characters With Case
13.1.4.4 Numeric Characters
13.1.4.5 Alphanumeric Characters
13.1.4.6 Digits in a Radix
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