1crate::mod_interface! 2{ 3 4 /// Describe change. 5 layer change; 6 /// Describe changer. 7 layer changer; 8 /// Describe system. 9 layer context; 10 11 /// Identity of resource. 12 layer identity; 13 /// Registry. 14 layer registry; 15 16 // exposed use Drawing; 17 18}