import xml.dom.minidom
import sys

def getElementsByAttrib(self, value, AName="ID-REF", list=[]):
  if self.nodeType == self.ELEMENT_NODE and \
       self.hasAttribute(AName) and \
      (self.getAttribute(AName) == value):
        list.append(value)
  for child in self.childNodes:
    list = list + getElementsByAttrib(child, value, AName)
    #list = list + getElementsByAttrib(child, value, AName, [])
  return list

xml.dom.minidom.Node.getElementsByAttrib = getElementsByAttrib

IN_FILENAME  = "index.html"

dom = xml.dom.minidom.parse(IN_FILENAME)
print dom.getElementsByAttrib("group","class")