title: omit xml declaration when saving xml with boost
body: <p>Is it possible, via the xml_writer_settings used as third parameter in the write_xml call, to omit the xml declaration when the function saves the xml? I mean, I would like not to have the initial "xml version="blah" encoding="blah blah" part. I'm searching the internet but I still haven't found an answer. How to do it?</p>