def _LeftoverPropertiesToXml(self):
    leftovers = set(self.keys())
    leftovers -= self._kind_properties
    leftovers -= self._contact_properties
    if leftovers:
      return u'\n  ' + '\n  '.join(self._PropertiesToXml(leftovers))
    else:
      return u''
remove columns (or group of columns), that match a certain pattern.
dataset/ETHPy150Open AppScale/appscale/AppServer/google/appengine/api/datastore_entities.py/GdKind._LeftoverPropertiesToXml--crossover with--dataset/ETHPy150Open CGATOxford/cgat/CGAT/Mali.py/Mali.removePattern