25.4.2. How is a RenderSet defined

Similar to layouts, render sets must be defined in a RenderSet descriptor. The RenderSet descriptor is located in the WEB-INF/layout folder of a web application, and is named portal-renderSet.xml. Here is an example descriptor:
               <?xml version="1.0" encoding="UTF-8"?>
<portal-renderSet>
 <renderSet name="divRenderer">
  <set content-type="text/html">
   <region-renderer>org.jboss.portal.theme.impl.render.DivRegionRenderer</region-renderer>
   <window-renderer>org.jboss.portal.theme.impl.render.DivWindowRenderer</window-renderer>
   <portlet-renderer>org.jboss.portal.theme.impl.render.DivPortletRenderer</portlet-renderer>
   <decoration-renderer>
     org.jboss.portal.theme.impl.render.DivDecorationRenderer
   </decoration-renderer>
  </set>
 </renderSet>
 <renderSet name="emptyRenderer">
  <set content-type="text/html">
   <region-renderer>org.jboss.portal.theme.impl.render.EmptyRegionRenderer</region-renderer>
   <window-renderer>org.jboss.portal.theme.impl.render.EmptyWindowRenderer</window-renderer>
   <portlet-renderer>
     org.jboss.portal.theme.impl.render.EmptyPortletRenderer
   </portlet-renderer>
   <decoration-renderer>
     org.jboss.portal.theme.impl.render.EmptyDecorationRenderer
   </decoration-renderer>
  </set>
 </renderSet>
</portal-renderSet>