Modelling types with UML based on associative arrays

Question

Let\'s say there is an PHP subsystem which uses only associative arrays to store some kind of structured data. So in fact there is no mechanism on language level to constraint t

Answer 1

Simply speaking: your design is correct. What you "could" do is to make Address an embedded class of Contact:

And if you wish so, you could show that it shall be implemented as associative array: