In Brief
Expression box controls in InfoPath 2003 make use of XPath expressions.
An expression box control automatically calculates a value from values entered in a form by the user.
The XPath position() function can be used to provide a row counter in a repeating table control.
The XPath multiplication operator, *, can be used in an expression box control to calculate the product of two values in the data source.
The XPath count() and sum() functions can be used to calculate the number of values of a particular type and the total of the values of a particular type, respectively.
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