Quotation marks in eval statements

If the eval statement is embedded within a set of quotation marks (in either OQL or the stitcher language), the quotation marks enclosing the variable or database column must be of the alternate type to the quotation marks in which the eval statement is enclosed. For example, if the eval statement is enclosed in single quotation marks (' ') then the variable or database column must be enclosed in double quotation marks (" "'). By default, when the eval statement does not occur within an embedded fragment, double quotation marks (" ") are used to enclose the variable or database column to be evaluated.