In order to illustrate the correlation features of BPEL, a simple online shop scenario will be used. In the first step of the scenario, a customer sends a shopping cart with the goods. In the second step, the customer specifies the delivery address for the order as well as the necessary credit card information.
The following activity diagram is a high-level description of the simple shop process:
The simple shop process starts, when a customer sends a shopping cart and a user ID.
The process requires the delivery address and the credit card number of the customer.
The information is sent in two different messages, which may arrive in an arbitrary sequence.
Finally the customer finishes the process and the shopping information is logged.
