test tag valu model model manag factori set root model model model manag factori creat model object cl model core factori build model facad tag valu cl tag type model extens mechan helper add tag valu cl model extens mechan factori build tag valu tag type tag valu object tag valu model facad tag valu cl tag type equal model facad valu tag tag valu tag valu model extens mechan helper remov tag valu cl tag valu object unus tag valu model extens mechan factori build tag valu xxx yyi model extens mechan helper remov tag valu cl unus tag valu model facad tag valu cl tag type 