This week's book giveaway is in the OCAJP 8 forum. We're giving away four copies of OCA Java SE 8 Programmer I Study Guide and have Edward Finegan & Robert Liguori on-line! See this thread for details.
How are you doing output of this document to a file? It seems to me that internally the DOM will all be in Unicode and the file encoding is established in the output method. Look at the Transformer properties - there is an ENCODING property. Bill