Using store with XML ajax in Ext JS 4

My post about store in ExtJS is too long to be a part of a single post; I'm going to find some times to write a longer article about the subject ... please come back soon ;)

source:

http://www.andyscott.id.au/2011/5/17/ExtJS-really-shines-with-data-models-and-its-ease-to-extend-its-functionality

http://www.sencha.com/forum/showthread.php?124362-Nested-loading-nested-saving-in-new-data-package&s=e6811e24ef58a5bbb135d1f5316c0aec