There are lots of widgets, adornments, and whatchamajiggers in UML. There are so many that you can spend a long time becoming an UML language lawyer, enabling you to do what all lawyers can write documents nobody else can understand.
In this chapter I have avoided most of the arcana and byzantine features of UML. Rather I have showed you the parts of UML that I use. I hope that along with that knowledge I have instilled within you the values of minimalism. Using too little of UML is almost always better than using too much.