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The operation of the process is very simple, and is
represented in Figure: Purchase Order Process Outline. Dotted lines represent
sequencing. Free grouping of sequences represents concurrent sequences. Solid
arrows represent control links used for synchronization across concurrent
activities. Note that this is not meant to be a definitive graphical notation
for WS- BPEL processes. It is used here informally as an aid to understanding.
On receiving the purchase order from a customer, the process initiates three
paths concurrently: calculating the final price for the order, selecting a
shipper, and scheduling the production and shipment for the order. While some
of the processing can proceed concurrently, there are control and data
dependencies between the three paths. In particular, the shipping price is
required to finalize the price calculation, and the shipping date is required
for the complete fulfillment schedule. When the three concurrent paths are
completed, invoice processing can proceed and the invoice is sent to the