associ role build associ role object object agg object object agg unidirect aggreg kind ak check aggreg kind agg aggreg kind ak check aggreg kind agg associ role role build associ role classifi role classifi role associ end role end associ end role role connect end set aggreg ak end set navig unidirect end associ end role role connect end set aggreg ak end set navig probabl redund just role 