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.datatype}, {self.access}, "
                f"{self.function_space}, stencil({self.stencil}))")
    return (f"arg_type({self.form}, {self.datatype}, {self.access}, "
            f"{self.function_space})")