"mixin" convention

A class that is supposed to be used only as a mixin has the suffix "Mixin" at rubicon. Not all classes can only be used as a mixin, however. Such classes don't have the suffix "Mixin". An example for this is the elaboration on DessertTopping vs. DessertToppingMixin. It can be found here: re-motion mixins basics -- the 'Uses' attribute and the 'ObjectFactory'#Using {{Uses}}. Whether you stick to this convention or not is a matter of taste (unless you work for rubicon, where the "mixin" convention is mandatory). All examples in this tutorial use this convention, however.