I managed to find this: jboss-portal-2.6.0-DR1-src/core/src/resources/dtd/portal-layouts_2_0.dtd View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=3996694#3996694 Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&p=3996694