It's not hard with e4x:

Let's say your arrayCollection (myAC) items have three properties...  
ID, Name and Address. Here's the code:

myXML:XMLList = <Users/>

for each (var item:Object in myAC) {
        myXML += <User ID={item.ID} Name={item.Name} Address={item.Address};
}

Not checked for validity, but you get the idea.

Shan

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