Adding an XML fragment as a child node in a pre-existing Element tree

[Rajarshi]

Hi, I'm using ElementTree for some RSS processing. The point where I
face a problem is that within an <item></item> I need to add another
child node (in addition to <link> etc) which is a well-formed XML
document (Chemical Markup Language to be precise).

So my code looks like:

import cElementTree as ET

    c = open('x.cml').readlines()
    c = string.join(c)
    cml = ET.XML(c)

Now I also have the following code:

    def addItem(self, title, link, description, cml = None):
        RSSitem = ET.SubElement ( self.RSSchannel, 'item' )

        ET.SubElement( RSSitem, 'title' ).text = title
        ET.SubElement( RSSitem, 'description' ).text = description

What I'm confused is how I can add the cml Element object that I
generated, to the RSSitem as a child node.

Do I need to manually traverse the tree of the CML document and add it
one by one to the RSSitem as a child node? Or is there a smarter way
to do this?

Any pointers would be greatly appreciated
Thanks,

Rajarshi