I need to pass a var inside dataTable to components.xml for performing a query. The var is not seen in the JSF context and components.xml accepts only variables in the JSF context.

<rich:dataTable onRowMouseOver="this.style.backgroundColor='#F1F1F1'" onRowMouseOut="this.style.backgroundColor='#{a4jSkin.tableBackgroundColor}'"
value='#{employee}' var='emp' id="empl">

<h:column>

 I need to pass emp.Id to components.xml. How do I do it?

</h:column>