How can the values of two elements in the XML be compared?

To check if two values are the same or not you should use the rule conditions support. To do this, create a rule containing the actions you would like to perform if the values are different, and then add a condition to this rule.

For the check XPath you would specify the two values you would like to compare. For example:

(/mvc:eForm/mvc :D ata/demo:contact/demo:forename != /mvc:eForm/mvc :D ata/demo:contact/demo :s urname)

This would mean that the rule would only ever fire if the two values were different (when the Check XPath will evaluate to true)

See Also:
How does the Compare action indicate differences between XML ...