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ProcessingInstruction - how to place before root elem

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I have an existing xml File and i use Xerces to read it in.
DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance();
DocumentBuilder builder = dbf.newDocumentBuilder();
org.w3c.dom.Document sourceDoc = builder.parse(new FileInputStream(outputPath));
But now i want to create a ProcessingInstruction ,i read the api and found that method :
createProcessingInstruction(java.lang.String target, java.lang.String data)
this method returns a ProcessingInstruction which i have to add lateron on the Dom tree.But how can i add this ProcessingInstruction BEFORE the Root-Element.
Has anyone of u already done that ? Must i create a new Document to add the ProcessingInstruction before the root-element ?

Thx a lot,
It is sorta covered in the JavaRanch Style Guide.
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