Boolean Values in IBM i SQL

How do you declare and use a Boolean value in an SQL Stored
Procedure on the IBM i? I've searched the online references and can't
find anything about it. There is even a page showing the SQL equivalent
data type for ILE RPG data types but the RPG IND data type is omitted from
that page.

Without testifying that they do what I expect (yet), I've at least
found that SQL doesn't complain about the following statements in a stored
procedure:

SET variable = True;
SET variable = False;

And though I found that it won't let me use the first statement
syntax, below, at least it doesn't complain about the second.

If CursorOpen Then ...
If CursorOpen = True Then ...

However, it won't let me use data type Boolean or Default False in
a variable declaration statement (yet). But the RSE editor does show the
words Boolean and False in blue -- indicating it thinks they are part of
the SQL syntax.

Declare CursorOpen Boolean Default False;

Anyone know how to define a Boolean variable in an IBM i SQL
Stored Procedure? Thanks.

Sincerely,

Dave Clark