find root candid collect messag activ predecessor activ veto isn messag veto includ collect candid param collect uml messag object param messag param veto exclud messag root collect candid root collect object object veto list object candid arrai list object object messag messag veto model facad activ messag collect predecessor model facad predecessor messag candid object predecessor predecessor model facad activ predecessor candid candid candid add messag candid 