Ah, like that. It's a fair point, but you're interpreting the model at too low a level. You don't have to model all possible values of scalar types (number, tex

Ah, like that. It's a fair point, but you're interpreting the model at too low a level. You don't have to model all possible values of scalar types (number, text) because the implementation of all possible values is known. I.e. you're writing a model that will drive the behavior of the application in terms of business rules, with specifications that matter to users of the application.