Seam Text is implemented by a lexer/parser generated by Antlr at buildtime. So, adding formatting rules at runtime isn't possible (AFAIK). View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4085900#4085900 Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&p=4085900