code: def decode_data_items(self, concatenated_str):
          
  
          data_items = []
          str_list = concatenated_str.split(self.SEPARATOR)
          for str in str_list:
  
              # '~base-64-strings' are decoded into integers.
              if len(str)>=1 and str[0]==self.INTEGER_PREFIX:
                  item = self.decode_int(str[1:])
  
              # Strings are decoded as-is.
              else:
                  item = str
  
              data_items.append(item)
  
          # Return list of data items
          return data_items
docs: Decodes a concatenated string into a list of integers and strings.
  
          Example:
              ``decode_data_items('abc|~B7|xyz')`` returns ``['abc', 123, 'xyz']``