docs: def content(self, value):
          """
          Setter for **self.__content** attribute.
  
          :param value: Attribute value.
          :type value: list
          """
  
          if value is not None:
              assert type(value) is list, "'{0}' attribute: '{1}' type is not 'list'!".format("content", value)
          self.__content = value