ABSTRACT
In Chapter 1 we saw that models are made out of variable sized collections of things and that things are fixed size groups of properties. In the last three chapters we have looked at how we can represent properties as values from basic types and how we can start to use operations on basic types to build functions which serve as methods for the things so represented. In this and the next chapter we are going to discuss the representation of variable sized collections of things with single properties. In Chapter 7, we will at last be able to manipulate collections of multi-property things.
