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#...
Reply to the post :
http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...