7.8. Fine-grained files for defining navigation, page actions and parameters

If you have a large number of different page actions and parameters — or even just a large number of navigation rules — it is sensible to split the declarations into several smaller files. You can define actions and parameters for a page with the view ID /calc/calculator.jsp in a resource named calc/calculator.page.xml. In this case, <page> is the root element, and the view ID is implied:
<page action="#{calculator.calculate}"> 
  <param name="x" value="#{calculator.lhs}"/> 
  <param name="y" value="#{calculator.rhs}"/> 
  <param name="op" converter="#{operatorConverter}" value="#{calculator.op}"/> 
</page>