In Python - Parsing a response xml and finding a specific text vaule

I'm new to python and I'm having a particularly difficult time working with xml and python. The situation I have is this, I'm trying to count the number of times a word appears in an xml document. Simple enough, but the xml document is a response from a server. Is it possible to do this without writing to a file? It would be great trying to do it from memory.

Here is a sample xml code:

<xml>
  <title>Info</title>
    <foo>aldfj</foo>
      <data>Text I want to count</data>
</xml>

Here is what I have in python

import urllib2
import StringIO
import xml.dom.minidom
from xml.etree.ElementTree import parse
usock = urllib.urlopen('http://www.example.com/file.xml') 
xmldoc = minidom.parse(usock)
print xmldoc.toxml()

Past This point I have tried using StringIO, ElementTree, and minidom to no success and I have gotten to a point where I'm not sure what else to do.

Any help would be greatly appreciated