n is either 1 or 0. The default value is 1.
When DelimitedIds is enabled (n = 1), a double-quoted string ("My String") is considered a delimited identifier within an SQL statement. When this parameter is not enabled, a double-quoted string ("My String") is considered a string constant or literal string.
For further details, refer to the SET OPTION command. For further details on delimited identifiers, see the “Identifiers” chapter in Using InterSystems SQL.