collect classifi classifi role object role role collect set role classifi role illeg argument except list classifi role arrai list classifi collect associ end associ end model facad associ end role associ end associ end end associ end end associ end role uml associ assoc end associ associ end end assoc connect classifi classifi end particip classifi role classifi classifi role role add classifi invalid object except invalid element except role 