+XBT_PUBLIC(xbt_dynar_t) MSG_storages_as_dynar(void);
+XBT_PUBLIC(msg_error_t) MSG_storage_set_data(msg_storage_t host, void *data);
+XBT_PUBLIC(void *) MSG_storage_get_data(msg_storage_t storage);
+XBT_PUBLIC(xbt_dict_t) MSG_storage_get_content(msg_storage_t storage);