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.