Code:
<?xml version="1.0" encoding="UTF-8"?>
That is basically just to declare what type of XML Standards they are using. This should always be 1.0 until Turbine uses a different version of XML Standards. Its not to define your version number of the skin as an author.
If you look at the code in my RSS XML feed you will see the same thing...
http://www.lotrointerface.com/rss/latest.xml