xml.dom.minidom:获取CDATA值

我能够在图像标记(见下面的XML)中获得值,但不能在类别标记中获得值。区别在于一个是CDATA节,另一个只是字符串。任何帮助都将不胜感激。

from xml.dom import minidom

xml = """<?xml version="1.0" ?>
<ProductData>
    <ITEM Id="0471195">
        <Category>
            <![CDATA[Homogenizers]]>        
        </Category>
        <Image>
            0471195.jpg
        </Image>
    </ITEM>
    <ITEM Id="0471195">
        <Category>
            <![CDATA[Homogenizers]]>        
        </Category>
        <Image>
            0471196.jpg
        </Image>
    </ITEM>
</ProductData>
"""

bad_xml_item_count = 0
data = {}
xml_data = minidom.parseString(xml).getElementsByTagName('ProductData')
parts = xml_data[0].getElementsByTagName('ITEM')
for p in parts:
    try:
        part_id = p.attributes['Id'].value.strip()
    except(KeyError):
        bad_xml_item_count += 1
        continue
    if not part_id:
        bad_xml_item_count += 1
        continue
    part_image = p.getElementsByTagName('Image')[0].firstChild.nodeValue.strip()
    part_category = p.getElementsByTagName('Category')[0].firstChild.data.strip()
    print '\t'.join([part_id, part_category, part_image])