Unless I'm missing the point, all you need to do is add the filehandle reference to your print statement. 
$root->print($file_handle);

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To print to two files, do this with two filehandles.

Update:Removed quotes per GrandFather's comments. My apologies on the typo.

In reply to Re: Twig Question: Create a new XML doc using twig? by ramrod
in thread Twig Question: Create a new XML doc using twig? by zericm

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