2.9.3.1 Conventions

In the following procedure specifications a convention to indicate the type of arguments is used:

cs

Is a character set.

s

Is a string.

char

Is a character.

char-list

Is a list of characters.

pred

Is a unary character predicate procedure, returning a true/false value when applied to a character.

obj

May be any value at all.

Passing values to procedures with these parameters that do not satisfy these types is an error.

Unless otherwise noted in the specification of a procedure, procedures always return character sets that are distinct (from the point of view of the linear–update operations) from the parameter character sets. For example, char-set-adjoin is guaranteed to provide a fresh character set, even if it is not given any character parameters.