String defaultPage1 = "page-of-"+FLOW_TYPE_1;
mainFlow.setPageName(defaultPage1);
mainFlow.setDefaultAfterPage(defaultAfterPage1);
FlowActivityImpl fa1 = new FlowActivityImpl().initInvisible(false);
FlowPropertyDefinitionImpl copiedBackProperty = new FlowPropertyDefinitionImpl("copiedBackProperty").initAccess(PropertyScope.flowLocal, PropertyUsage.io);
fa1.addPropertyDefinition(copiedBackProperty);
mainFlow.addActivity(fa1);
FlowImpl subFlow = new FlowImpl(FLOW_TYPE_2);
String defaultAfterPage2 = "default-after-page-for-"+FLOW_TYPE_2;
String defaultPage2 = "page-of-"+FLOW_TYPE_2;