>>> import xml.dom.minidom
>>> 
>>> example = """<?xml version="1.0"?>
... <!DOCTYPE keys [
...     <!ELEMENT key ANY>
...     <!ATTLIST key id     ID     #REQUIRED
...                   name   CDATA  #REQUIRED
...     >
... ]>
... <keys>
...     <key name="TEST" id="moo">value</key>
...     <key name="TEST2" id="unique">value2</key>
... </keys>
... """
>>> doc = xml.dom.minidom.parseString(example)
>>> doc.getElementById("unique").childNodes[0].nodeValue
u'value2'
>>> 
>>> # Auto pairnei ola ta tags <key>
... for key in doc.getElementsByTagName("key"):
...     print("Key: " + key.getAttribute("name"))
...     print("Value: " + key.childNodes[0].nodeValue)
... 
Key: TEST
Value: value
Key: TEST2
Value: value2
>>> # Auto einai me monadiko id, xrisimo gia ekseuresi enos mono xml tag
... key2 = doc.getElementById("unique")
>>> print("Key: " + key2.getAttribute("name"))
Key: TEST2
>>> print("Value: " + key2.childNodes[0].nodeValue)
Value: value2