overrid updat listen properti chang listen listen object model element properti chang event pce pce sourc model element stereotyp equal pce properti paramet equal pce properti tag valu equal pce properti pce add associ event add element listen listen pce valu pce remov associ event remov element listen listen pce old valu model uml factori remov model element type paramet object param model facad paramet model element pce sourc param type equal pce properti pce add associ event add element listen listen pce valu pce remov associ event remov element listen listen pce old valu 