A flow may declare one or more instance variables.
			These variables are allocated when the flow starts.
			Any @Autowired transient references the variable holds are also rewired when the flow resumes.
		
				Use the var element to declare a flow variable:
			
<var name="searchCriteria" class="com.mycompany.myapp.hotels.search.SearchCriteria"/>
			
				Make sure your variable's class implements java.io.Serializable, as the instance state is saved between flow requests.