@staticmethod
def p_axis_descr_optional(p):
    """axis_descr_optional : read_only
                               | format
                               | annotation
                               | axis_pts_ref
                               | max_grad
                               | monotony
                               | byte_order
                               | extended_limits
                               | fix_axis_par
                               | fix_axis_par_dist
                               | fix_axis_par_list
                               | deposit
                               | curve_axis_ref"""
    p[0] = p.slice[1].type, p[1]
