+XBT_PUBLIC(int) xbt_automaton_state_compare(xbt_automaton_state_t s1, xbt_automaton_state_t s2);
+
+XBT_PUBLIC(int) xbt_automaton_propositional_symbols_compare_value(xbt_dynar_t s1, xbt_dynar_t s2);
+
+XBT_PUBLIC(int) xbt_automaton_transition_compare(const void *t1, const void *t2);
+
+XBT_PUBLIC(int) xbt_automaton_exp_label_compare(xbt_automaton_exp_label_t l1, xbt_automaton_exp_label_t l2);
+
+XBT_PUBLIC(void) xbt_automaton_state_free_voidp(void *s);
+
+XBT_PUBLIC(void) xbt_automaton_state_free(xbt_automaton_state_t s);
+
+XBT_PUBLIC(void) xbt_automaton_transition_free_voidp(void *t);
+
+XBT_PUBLIC(void) xbt_automaton_exp_label_free_voidp(void *e);