#from xml.dom.ext.reader import Sax2
#from xml.dom import *
#reader = Sax2.Reader().fromString('<?xml version="1.0" ?><test>hello</test>')
#n = reader.documentElement
#c = n.firstChild
#
#dom = getDOMImplementation()
#doc = dom.createDocument(None, 'test', None)
#n2 = doc.documentElement
#n2.appendChild(c)
#

## Solution:
from xml.dom.ext.reader import Sax2
from xml.dom import *
reader = Sax2.Reader().fromString('<?xml version="1.0" ?><test>hello</test>')
n = reader.documentElement
c = n.firstChild

dom = getDOMImplementation()
doc = dom.createDocument(None, 'test', None)
n2 = doc.documentElement
c2 = doc.importNode(c, 3)
n2.appendChild(c2)

print doc.toxml()