I am new one to sencha, can any one help me!

i want to display nested list using xml file or url. Below is my xml file.

<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
<ns2:categories xmlns:ns2="http://www.abc.com/tar">
<category catId="96" title="News"/>
<category catId="97" title="Articles">
<category catId="101" title="Destinations"/>
<category catId="213" title="New Destinations"/>

Can any one help me to read any display data in nested list format. Please help me to solve the problem. I tried all examples which sencha provided but not getting any success.

Please help me............

Thank in Advance!