add fresh constraint model restrict pars given current ocl grammar ol li name capit letter li featur lower letter ol add constraint check ocl pars constraint object mme context ocl util inner enclos namespac mmei target context model facad mme context target model facad mmei target context context equal fix issu target target equal fix issu charact upper context model facad mmei target charact upper target model facad featur mmei target charact lower target todo option pane messag dialog ocl toolkit requir name capit letter attribut oper name lower letter requir correct convent option pane error messag creat constraint element repres constraint ad target time actual edit take place ensur syntact correct constraint store target al constraint add constraint ad 