How to remove XML declation from the document while transforming the file

I am using DOM parser to parse my xml content.

After completing the parsing, I transformed the document to a new file. But it generates a new file that had added a new line for XML declaration.

<?xml version="1.0" encoding="UTF-8" standalone="no"?>
 <TFORMer major="1" minor="0">
 <!-- (c) 1998-2008 TEC-IT Datenverarbeitung GmbH -->
 

In above line, the xml version declaration is automatically added by the transformer.

How do I configure the transformer to not to add that XML declaration line?

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