I see the current conversion of dataframe to xml need to be improved.

My dataframe schema is a perfect nested schema based on structs but when I create a xml I have the follow issues:

1) I can't add elements to root

2) rootTag and rowTag are required

In the end I remove the first level of hierarchy (rowTag) using string methods or manually. The rowTag is already part of the dataframe nested schema so it doesn't make any sense