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  ANSI Common Lisp   13 Characters   13.1 Character Concepts

13.1.6 Ordering of Characters

The total ordering on characters is guaranteed to have the following properties:

Of the standard characters, those which are alphanumeric obey the following partial ordering:

 either 9<A or Z<0
 either 9<a or z<0                                                      
This implies that, for standard characters, alphabetic1 ordering holds within each case (uppercase and lowercase), and that the numeric characters as a group are not interleaved with alphabetic characters. However, the ordering or possible interleaving of uppercase characters and lowercase characters is implementation-defined.

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