Here's another XXE bug for you (resulting in file theft), just to make the point that this class of bugs is well worth watching out for in client-side applications (such as a browser :)
The good news here is that this WebKit regression was quickly fixed by Apple -- and in time for the Safari 4 final release -- so no production browser should ever have been affected. Just the Safari 4 Beta.
Full credit here to Carlos Pizano who noticed the WebKit regression due to a collision with the Chrome sandbox. I just put together the Safari test case / demo:
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