store pars guard uml object relat given messag param uml messag uml messag object param guard guard express param parallel parallel execut indic param iter iter express oppos condit handl guard object uml messag builder guard parallel iter store guard condit iter express recurr field action guard guard builder guard trim iter parallel guard guard insert guard guard insert object expr model data type factori creat iter express express languag guard model common behavior helper set recurr model facad action uml messag expr 