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# expression Attribute (calculatedField Element)

Contains the formula, in the form of an XPath expression, to be evaluated. The result is stored in the target location.

## Type

`xsd:string`

## Parent Elements

Element | Description
--- | ---
calculatedField | Defines an individual calculation, including the formula, when the calculation is to be performed, and where the result will be stored.

## Definition

    <xsd:attribute name="expression" type="xsd:string" use="required" ></xsd:attribute>

## Remarks

Note This item is not supported when the Disable Service Pack features option on the Advanced tab of the Options dialog box in InfoPath is selected or when Microsoft Office 2003 Editions Service Pack 1 or later is not installed. Any form defined by a form definition file (.xsf) that includes this item cannot be opened in InfoPath when service pack features are disabled or unavailable.

## Example

The following is an example of the expression attribute as it is used in the calculatedField element:

    <xsf:calculations>
     <xsf:calculatedField
      target="/my:myFields/my:average"
      expression="xdMath:Avg(../my:expenses/my:expense/my:amount)"
      refresh="onChange" />
    </xsf:calculations>

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