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How to save etree xml object? problem loading lxml etree

I have an etree object called projectxml:

projetxml type <type 'lxml.etree._Element'>

I need to save it to disk, so I convert it to an element tree:

savedxml=et.ElementTree(projetxml)
savedxml.write('/home/simon/Vysis.xml')

Another script was supposed to load the Vysis.xml file and two other files of the same type:

vysis=et.parse('/home/simon/Vysis.xml')
asi=et.parse('/home/simon/ASI.xml')
psi=et.parse('/home/simon/PSI.xml')

Now the objects asi, psi and vysis lxml are of type, for example:

<lxml.etree._ElementTree object at 0xa7eaf8c>

My problem is that I can no longer do:

R=et.Element('DataBase')
R.append(asi)
R.append(psi)
R.append(vysis)

because of a mistake:

R.append(asi)
  File "lxml.etree.pyx", line 697, in lxml.etree._Element.append (src/lxml  /lxml.etree.c:35471)
TypeError: Argument 'element' has incorrect type (expected lxml.etree._Element, got lxml.etree._ElementTree)

I guess I have two solutions. The first one would be to avoid converting etree.Element to etree.ElementTree and save it “directly”, but I don't know how to do it. The second solution will be the inverse conversion of the etree.ElementTree type to the etree.Element type ... Should there be a clean solution for saving / loading an xml object?

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ElementTree, Element. parse , getroot.

vysis=et.parse('/home/simon/Vysis.xml').getroot()
asi=et.parse('/home/simon/ASI.xml').getroot()
psi=et.parse('/home/simon/PSI.xml').getroot()

R=et.Element('DataBase')
R.append(asi)
R.append(psi)
R.append(vysis)
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