properti chang properti chang event evt evt sourc activ graph evt delet instanc event remov equal evt properti model pump remov model event listen activ graph remov namespac project trash evt sourc state machin object namespac model facad namespac state machin namespac namespac namespac activitygraph chang set namespac namespac uml mutabl graph support graph model set home model namespac 