param event mdr indic plan chang netbean api mdr event mdr pre chang listen plan chang plan chang mdr chang event veto readonli chang instanc event type instanc event event instanc creat ref base object element ref base object instanc event sourc read element veto chang except sourc ref object element instanc event instanc read element veto chang except sourc element associ event todo associ chang hard check easili don know end associ signific check metamodel navig end ref object element associ event fix element read element veto chang except element element attribut event ref object element ref object attribut event sourc read element veto chang except element element event count mutex pend event prototyp log code enabl modifi discov creat certain type event log debug enabl associ event associ event ae associ event ae type associ event event associ remov namespac equal ae end ae fix element uml log debug remov element ae old element ae fix element 