def METHOD_NAME(self):
    '''
    :returns: the metadata represented by this class as Fortran.
    :rtype: str
    '''
    if self.stencil:
        return (f"arg_type({self.form}*{self.vector_length}, "
                f"{self.datatype}, {self.access}, {self.function_space}, "
                f"stencil({self.stencil}))")
    return (f"arg_type({self.form}*{self.vector_length}, {self.datatype}, "
            f"{self.access}, {self.function_space})")