Those have been in UML for years. (Google it.) Actually, that's the problem: everything is in UML. I am sure someone pointed out that "X" had it but UML didn't, so they made sure to add it.
BTW, a 20 year old link is not going to present anyone with up to date tech info. You have to make allowances for the progress of rival technology.
BTW, a 20 year old link is not going to present anyone with up to date tech info. You have to make allowances for the progress of rival technology.