An XSLT based rule used for enforcing rules on data (calculated fields).
Input context: Full document
It is added as a normal data structure rule with the difference that the TargetField attribute is left empty.
Then you add a new Complex Data Rule and in the Settings panel define the destination data structure where the transformed data will be merged.
If you want to also apply a condition rule in the data structure rule pointing to a complex data rule, the attribute IsPathRelative must be set to False and the XPath expression contain the full path, e.g. /ROOT/element/@attribute.