Set the DC Description literal value

        :param value: Value of the title node
        :param lang: Language in which the value is

def set_description(self, value: Union[Literal, Identifier, str], lang: str= None):
        """ Set the DC Description literal value

        :param value: Value of the title node
        :param lang: Language in which the value is
        """
        return self.metadata.add(key=DC.description, value=value, lang=lang)