Java EE (Java Enterprise Edition) General Discussion

I am developing a simple software in Java, to improve my programming skills, the output of this program is an XML file. I am very new to XML. My question is that, every time the XML file is opened the tree is in expanded form, which appears to be the default setting at run time. I want it to be fully collapsed when the XML file is opened. I have read about certain solutions to this problem by using XSL or CSS. I am not familiar with XSL at the moment so I have not explored it yet. Is there any other way around this problem.

I would like someone to just point me in the right direction so that I can eventually get to the answer.

Any help will be highly appreciated.

Thankyou