Ubuntu desktop background

[Doooh Head]

Hi All,
I am looking for some information about Ubuntu's desktop background.  There is a UI for changing the desktop background but there is also a way to make the desktop appear to show an animated (set of) image(s) whereby you create an XML file listing all of the images that you want to display, duration, etc.  I would like some information about this XML file, perhaps a DTD, or some description about what is possible in it.  Does anyone know where I can find this out?
I am a programmer and am looking to write a small java app that builds these xml files.
Any help would be appreciated.

Doooh Head

 		 	   		  
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