adding node to an xml file

[gundarap]

Hello everybody,
I'm a starter to Python programming.
My goal is to first read an xml file and add the elements to the dictionary.
Note that xml file I'm using is a simple file without any attributes...
e.x.
<?xml?>
<AR>
<BD>Data</BD>
</AR>
Next step is to add a node to the xml file and verify if the node exists in the xml file or not.
Can anybody, please help me with the valuable code?
Thanks in advance.
Regards,
Pavan