+ def add_attribute(self, elem, name, value):
+ opt = etree.SubElement(elem, name)
+ opt.text = value
+
+ def remove_attribute(self, elem, name, value):
+ if elem is not None:
+ opts = elem.iterfind(name)
+ if opts is not None:
+ for opt in opts:
+ if opt.text == value:
+ elem.remove(opt)
+