expression Attribute (calculatedField Element)
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Contains the formula, in the form of an XPath expression, to be evaluated. The result is stored in the target location.
||Defines an individual calculation, including the formula, when the calculation is to be performed, and where the result will be stored.
<xsd:attribute name="expression" type="xsd:string" use="required" ></xsd:attribute>
The following is an example of the expression attribute as it is used in the calculatedField element: