+/************************** Environment ***********************************/
+XBT_PUBLIC(msg_as_t) MSG_environment_get_routing_root(void);
+XBT_PUBLIC(const char *) MSG_environment_as_get_name(msg_as_t as);
+XBT_PUBLIC(xbt_dict_t) MSG_environment_as_get_routing_sons(msg_as_t as);
+XBT_PUBLIC(const char *) MSG_environment_as_get_property_value(msg_as_t as, const char *name);
+XBT_PUBLIC(const char *) MSG_environment_as_get_model(msg_as_t as);
+XBT_PUBLIC(xbt_dynar_t) MSG_environment_as_get_hosts(msg_as_t as);