toString() differs from save()

"Nick de Graeve" <[email protected]>
Newsgroups gmane.text.xml.xmlbeans.user
Message-ID <[email protected]> 
When I save my XMLBean to disk I get a slightly different result from when I do a toString() or xmlText().
The formatting and contents are the same but the file on disk starts with

<?xml version="1.0" encoding="UTF-8"?>

while the string does not.

How can I make sure both are exactly the same?
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