Data source not printing anything in "Data Log"

 I am trying to read repsonse in XML format and create a data source. I am attaching a screen shot for the datasource test step editor. When I run this test step, I don't see the data being printed in "Data Log" section. It just says got 1 row in 6ms but I don't see the output. 

Any idea why I don't see the  //Response[1]/e[1] in "Data Log" when I run the test step ?