It's a Facelets feature, I think. Google for "Facelets content-type FAQ" and it'll turn up. View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4042556#4042556 Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&p=4042556