How to remove the empty tags in request xml depending on the scenario

Hi ,

I have two scenario for the same request xml.

a)  i need to send the request xml with the empty tags after parameterizing the values .
b) i need to delete the empty nodes from the request xml and send it.

I am executing the testcases using the data driven approach(automating the test cases).

How can i achieve it using the groovy scripting in soapui.

Thanks in advance
saberesh