Declarative way to allow an action to set value before navigation

On Actions like CommandButton, CommandLink,.. you can allow them to set value before navigating to another page by using <af:setActionListener>

Example:
<af:commandLink text="#{row.formattedName}" id="cl1" action="toSavePage">
 <af:setActionListener from="phoneNumber" to="#{pageFlowScope.phoneNum}"/>
 <af:setActionListener from="#{row.empId}" to="#{pageFlowScope.selectedEmployeeId}"/>
 </af:commandLink>