Need help to write data onto an XML file after reading data from another xml file

[varun7rs at gmail.com]

Hello Users,

I am in dire need of your help. I have been working on this code for quite some time and it is making me restless. All I am trying to do is,

1. Read data from an xml file. Source: http://sndlib.zib.de/coredata.download.action?objectName=germany50&format=xml&objectType=network

2. The data I'm concerned about is the node ID, co-ordinates, capacity of the links, source and destination names.

3. I'm creating a topology with this information and the topology is same as the one given in the xml file. But, I'd like to add a few extra parameters and demands which I have mentioned in the .py file. 

4. This is where I am faltering. I am just not able to create this topology. The file has also become really messy as I tried a lot of weird stuff and commented it out as it did not work. 

5. I'll attach the relevant files and I'd like to write the output onto a new xml file. 

I'd be glad if any of you could help me out. I'm indebted to you guys. Oh I was not aware that I could  attach files. Anyways, here is the link to the files I'm working on
https://www.dropbox.com/sh/i8h321y7c9c60vt/AADzDj7oOM8YU76Ww6W4LIPYa

Thanks a lot everyone