объединение xml

#!/usr/bin/python
#*- coding: utf-8 -*-
 
import os,sys
from lxml import etree
 
 
myGroupName = u'Чаты1'
myChatName = u'чат'
myChatComment = u'чат'
userName = '''user1'''
jabberAccount = '''user1@example.com'''
jabberServer = 'example.com'
 
try:
    from xml.dom import minidom
    homedir = "/home/%s/python/" % userName
    blistfile='''<?xml version="1.0" ?>
<purple version="1.0">
<blist>
        <group name="Group1">
                <setting name="collapsed" type="bool">0</setting>
                <contact>
                        <buddy account="user1@example.com/" proto="prpl-jabber">
                                <name>user2@example.com</name>
                                <alias>Иванов Иван</alias>
                                <setting name="last_seen" type="int">1390891491</setting>
                                <setting name="servernick" type="string">Иванов Иван</setting>
                        </buddy>
                        <setting name="gtk-mute-sound" type="bool">0</setting>
                </contact>
        </group>
</blist>
<privacy>
        <account mode="1" name="user1@example.com/" proto="prpl-jabber"/>
</privacy>
</purple>
'''
 
    if True :
        #Buddy list file opening and get groups-list
        blist=minidom.parseString(blistfile)
        elements=blist.getElementsByTagName("group")
 
        group = etree.Element('group', name=myGroupName)
        #setting
        childSetting = (etree.Element('setting', name="collapsed", type="bool"))
        childSetting.text="0"
        group.append(childSetting)
        #chat
        childChat = (etree.Element('chat', account=jabberAccount+'/', proto="prpl-jabber"))
        #alias
        childAlias = (etree.Element('alias'))
        childAlias.text = myChatName
        childChat.append(childAlias)
        #component
        childComp1 = (etree.Element('component', name="server"))
        childComp1.text = 'conference.'+jabberServer
        childChat.append(childComp1)
        childComp2 = (etree.Element('component', name="room"))
        childComp2.text = myChatComment
        childChat.append(childComp2)
        childComp3 = (etree.Element('component', name="handle"))
        childComp3.text = userName
        childChat.append(childComp3)
        #setting
        childSetting1 = (etree.Element('setting', name="gtk-persistent", type="bool"))
        childSetting1.text = "1"
        childChat.append(childSetting1)
        childSetting2 = (etree.Element('setting', name="gtk-mute-sound", type="bool"))
        childSetting2.text = "0"
        childChat.append(childSetting2)
        childSetting3 = (etree.Element('setting', name="gtk-autojoin", type="bool"))
        childSetting3.text = "1"
        childChat.append(childSetting3)
 
        group.append(childChat)
        s = etree.tostring(group, pretty_print=True, encoding='utf-8')
        print s
        #blist.childNodes[0].childNodes[1].appendChild(group)
    
        #Add sorted groups
        for n in elements:
            blist.childNodes[0].childNodes[1].appendChild(n)
 
        print blist.toxml()
 
        #Write to Buddy list file
        #blistout=open(homedir+blistfile,"w")
        #blistout.write(blist.toxml().encode("utf-8"))
        #blistout.close()
except Exception as e:
    sys.stderr.write(str(e))