[xml] how to not save <?xml version="1.0">

I am a xml beginnner, and I am using libxml2 to edit some data for a system configuration file which doesn't contain <?xml version="1.0">(all elements in this xml are quite standard). Even Though adding this tag to the file has no effect on anything, I still don't like to add it.
Currently I do this:
do changes through tree
I don't know when the <?xml version="1.0"> is added, during parseFile ? or saveFile? Anyway, how can I avoid adding this?
Thanks and Regards,

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