Thank you krasig for help. You can attach new content assistent XML to https://jira.jboss.org/jira/browse/JBIDE-3553 and we check and commit it to SVN. We use some utils to generate such XMLs because there is a lot of work to do it manually.. And we are going to improve this approach with use of XML in order to have content assistent for new TLD/Facelet libs in Facelets automaticly without need to generate such XML and adding it in JBoss Tools. View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4201919#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...