How to add xml-stylesheet tag in a XML File using libxml2?

[RyanM]

I'd like to know how I could insert the special tag \[code\]<?xml-stylesheet type="text/xsl" href="http://stackoverflow.com/questions/10618005/XYZ.xslt"?>\[/code\]in a document, just after the \[code\]<?xml version="1.0" ... ?>\[/code\] andbefore the Doc root element ??I currently use libxml2 version 2.7.8Best regards