Can't you just write this to the file yourself?
On Aug 26, 2009, at 7:15 PM, Sebastian Mach wrote:
Passing boost::archive::no_header as the second parameter to xml_oarchive() yields the following file for given test:
<picogen-qt-scene class_id="0" tracking_level="0" version="0">
<comment>hello world!</comment>
<fenum>two</fenum>
</picogen-qt-scene>
Unfortunately, "<?xml version="1.0" encoding="UTF-8" standalone="yes" ?>" is now missing, too.