title: minidom.parseString Error
body: <p>I get this error while parsing my <strong>xml</strong> data to prettify it : </p>
  
  <pre><code>File "script.py", line 97, in buildXML
      reparsed = minidom.parseString(clean_xml)
    File "/usr/lib64/python2.7/xml/dom/minidom.py", line 1931, in parseString
      return expatbuilder.parseString(string)
    File "/usr/lib64/python2.7/xml/dom/expatbuilder.py", line 940, in parseString
      return builder.parseString(string)
    File "/usr/lib64/python2.7/xml/dom/expatbuilder.py", line 223, in parseString
      parser.Parse(string, True)
  xml.parsers.expat.ExpatError: unbound prefix: line 5, column 109
  </code></pre>
  
  <p>My code :</p>
  
  <pre><code>items = ET.Element("items")
  
  title = SubElement(item, "title")
  title.text = incident.title
  
  clean_xml = ET.tostring(items, 'utf-8')
  reparsed = minidom.parseString(clean_xml)
  clean_xml = reparsed.toprettyxml(indent="  ")
  </code></pre>