On Thu, May 29, 2008 16:17, Hareendra Pelige wrote: I would say that this syntax from your email is easiest to use. As Mark explained, the xml-type language is old, version 2.0. You can define a domain specific language, but that's worth the effort only in larger projects, I'd say. Christine rule "Hello World" when m : Message( status == Message.HELLO, message : message) then System.out.println( message ); modify ( m ) { message = "Goodbyte cruel world", status = Message.GOODBYE }; System.out.println( message ); end