+XBT_PUBLIC(void) xbt_state_free_voidp(void *s);
+
+XBT_PUBLIC(void) xbt_state_free(xbt_state_t s);
+
+XBT_PUBLIC(void) xbt_transition_free_voidp(void *t);
+
+XBT_PUBLIC(void) xbt_exp_label_free_voidp(void *e);
+
+XBT_PUBLIC(void) xbt_propositional_symbol_free_voidp(void *ps);
+
+XBT_PUBLIC(void) xbt_automaton_free(xbt_automaton_t a);