list edg object port list object edg arrai list object hierarchi model facad model element port iter model facad client depend port iter edg add generaliz element model facad generaliz element port iter model facad gener port iter edg add classifi model facad classifi port iter model facad associ end port iter object end object assoc model facad associ end assoc iter model facad associ end assoc iter object assoc end end equal assoc end model facad navig assoc end edg add assoc end edg 