Language Guide

CHAPTER 3
Values
Value Class Definitions 43
Constant 3
A value of class Constant is a reserved word defined by AppleScript or an
application in its dictionary. Applications define sets of values that can be used
for parameters of a particular command; for example, the value of the saving
parameter of a Close command must be one of the three constants yes, no,
and ask.
LITERAL EXPRESSIONS
yes
no
ask
PROPERTY
Class The class identifier for the object. This property is read-only,
and its value is always constant.
ELEMENTS
None
OPERATORS
The operators that take values of class Constant as operands are &, =, , and As.
COERCIONS HANDLED
AppleScript supports coercion of a constant to a single-item list.
NOTES
Constants are not strings, and they must not be surrounded by
quotation marks.
You cannot define your own constants; constants can be defined only
by applications and AppleScript.