| http://www.w3.org/ns/prov#value | - In the following, except a case where special notification is made, the interaction of information between the cashier terminal 10 and the synchronizing server 30 is performed via a communication line 18, and the interaction of information between the user terminal 20 and the synchronizing server 30 is performed via a radio communication channel 28 and a communication line 38.
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