param cl uml entiti check list offend list set comput offend object cl collect asc model facad associ end cl asc asc size enumer descend gen descend class singleton gen cl descend element list set descend list set descend element descend add descend element todo gen navig class list set off object ae asc object model facad associ ae list conn arrai list model facad connect conn size object end conn ae conn end conn model facad navig end object cl model facad type end descend contain cl off off list set off add cl off add off add cl off 