Final answer:
To create a state machine diagram for a supermarket cashier, one needs to identify the states and transitions relevant to the cashier's role. For composite states of type Orthogonal, split a state into independent regions that represent parallel processes within the role.
Step-by-step explanation:
To make a state machine diagram for a supermarket cashier as outlined in the use case, we would begin by identifying the various states involved in a cashier's interaction with customers and the system. A simple version could include states like 'Idle', 'Scanning Items', and 'Processing Payment', with transitions such as 'Customer Arrives', 'Last Item Scanned', and 'Payment Completed' triggering the cashier's change from one state to another.
Regarding the creation of composite states of type Orthogonal, this refers to a state that can be decomposed into two or more concurrent regions (substates) with each region being independent of the others. For instance, a cashier's 'Processing Payment' state could be divided into two orthogonal composite states: 'Processing Card Payment' and 'Processing Cash Payment', which operate concurrently.