Saving an XML tree externally?!?!

Hi guys,

Im building a website at the minute for a mate of mine and I’ve used XML to load a bunch of data into the site. The problem is that my mate knows nothing of XML and as a bit of a challenge I’d like to write a second app that will allow her to update the content without having to ever look at an XML file.

I’m hoping someone here might have done something similar and can point me in the right direction as to AS commands that will allow me to output the XML tree to file so the next time her site loads, the new data is loaded with it. Any ideas? Should I be using flash for this? Or perhaps using javascript or php in conjunction with the flash movie to save the XML tree??

Any help is appreciated.
Cheers.