_O_b_j_e_c_t _A_t_t_r_i_b_u_t_e _L_i_s_t_s
	
	     attributes(obj)
	     attributes(obj) <- list
	
	_D_e_s_c_r_i_p_t_i_o_n:
	
	     This function provides access to an object's attribute
	     list.  The simple form above returns the an object's
	     attribute list.  The assignment form makes the list on
	     the right-hand side of the assignment, the object's
	     attribute list.
	
	_S_e_e _A_l_s_o:
	
	     attr.
	
	_E_x_a_m_p_l_e_s:
	
	     # strip an objects attributes
	     attributes(x) <- NULL