config.xml

<?xml version="1.0" encoding="UTF-8"?>

<widget xmlns="http://www.w3.org/ns/widgets" 
		xmlns:ub="http://uniboard.mnemis.com/widgets"
        id="http://www.example.net/widgets/helloworld" 
        version="1.1"
        width="538"
        height="170" 
		ub:resizable="false">
		
		<name>Words/Letters sortable</name>
		<description>Sort the words/letters to make the right phrase/word.</description>
		<preference name="skin"
		            value="uniboard"/>
		<content src="index.html"/> 
</widget>