todo document deprec tfmorri us link uml activ diagram object graph model deprec uml sequenc diagram creat graph model mutabl graph model gm sequenc diagram graph model set graph model gm creat layer layer perspect lai layer perspect mutabl gm set layer lai creat render sequenc diagram render render sequenc diagram render lai set graph node render render lai set graph edg render render defin log lp log granular type statement lp log local end method lp log local nest ifdef sequencediagram log debug creat sequenc diagram endif 