simple-string,
string,
vector,
simple-array,
array,
sequence,
t
A simple string is a specialized one-dimensional
simple array whose elements are of type character or a suptype of type character.
When used as a type specifier for object creation,
simple-string means (simple-array character (size)).
Abbreviating.
(simple-string [size])
size—a non-negative fixnum, or the symbol *.
This denotes the union of all types
(simple-array c (size)) for all subtypes c of
character; that is, the set of simple strings of size size.