code: def Field(self, field, Value = None):
          '''
          Add field to bitmap
          '''
          if Value == None:
              try:
                  return self.__Bitmap[field]
              except KeyError:
                  return None
          elif Value == 1 or Value == 0:
              self.__Bitmap[field] = Value
          else:
              raise ValueErrof Field(self, field, Value = None):
          '''
          Add field to bitmap
          '''
          if Value == None:
              try:
                  return self.__Bitmap[field]
              except KeyError:
                  return None
          elif Value == 1 or Value == 0:
              self.__Bitmap[field] = Value
          else:
              raise ValueError
docs: Add field to bitmap