object build node object element type object contain object element featur owner featur model impl facad featur contain contain model impl facad owner contain support implement special element support build node element type meta type attribut element core build attribut contain element type meta type oper element core build oper contain element type meta type recept element model impl common behavior factori creat recept model impl core helper add own element contain element element type meta type enumer liter element core build enumer liter contain element type meta type extens point element model impl us case factori build extens point contain build element us exist build node element build node element type contain namespac element namespac namespac element set namespac namespac contain namespac model impl core helper add own element contain element element 