Tutorial on Chatt-system, using XML

Hi!

Im wondering if anyone has come across any tutorial on how to make an online Chatt-system using XML as a “database”, and php to alter the xml-document on the server. Should be as easy as possible…

Thanx

Not XML, but mySQL: www.phpforflash.com is support forum, book is by friends of ED called “Advanced php for flash”, source files at www.friendsofed.com