code: def value_splitter(self, reference, prop, value, mode):
          
          items = []
  
          if mode == 'json-list':
              try:
                  items = json.loads(value)
              except json.JSONDecodeError as e:
                  print(value)
                  msg = ("Reference '{ref}' raised JSON decoder error when "
                         "splitting values from '{prop}': {err}'")
                  raise SerializerError(msg.format(ref=reference, prop=prop,
                                                   err=e))
          else:
              if len(value) > 0:
                  items = value.split(" ")
  
          return items
docs: Split a string into a list items.
  
          Default behavior is to split on white spaces.
  
  
          Arguments:
              reference (string): Reference name used when raising possible
                  error.
              prop (string): Property name used when raising possible error.
              value (string): Property value to split.
              mode (string): Splitter mode. Default should come from
                  ``ManifestSerializer._DEFAULT_SPLITTER``.
  
                  Available splitter are:
  
                  * ``white-space``: Simply split a string on white spaces;
                  * ``json-list``: Assume the string is a JSON list to parse;
  
          Returns:
              list: