pars transit descript line form pre event signatur guard condit action express pre charact line ignor event signatur format ul li chang event condit li time event durat li event paramet list li signal event ul remark uml standard doe make distinct syntax event signal event paramet simplic user friendli chose distinct user want paramet signal event add properti panel diagram altern solut creat event edit exist event chang type todo function fail event signatur contain param tran transit object appli param pars transit object pars except match object pars transit object tran pars except trim index index index msg pars error transit match squar bracket pars except translat local msg msg pars error transit bracket instead slash pars except translat local msg token token token event signatur guard condit action express token token token token token trim token end guard condit token substr token length start token event signatur token end token action express token event signatur pars event signatur tran event signatur pars trigger tran event signatur guard condit pars guard tran guard condit substr guard condit index action express pars effect tran action express trim tran 