Retrieve by XPath using String variable

Allow using [SomeStringXpath] as XPath query in the retrieve from database microflow action.

There are situations where it is not known before which search criteria to use:

• A published REST service that returns a list and allows many optional search criteria, 
• Search criteria to limit dashboard charts

In such case, putting the Xpath together is a pain. It is possible to check whether the variable is set in the XPath itself but that degrades performance of the final SQL statement. It would be best to only include the search criteria that are relevant. That is easy to do with basic string functions in the microflow.

Now I often use a small Java action to do the retrieve.