| http://www.w3.org/ns/prov#value | - The purchase data includes information such as the location of the purchase, the items purchased, the price of each item purchased, and CID. The purchase information can be stored electronically in a general purpose computer in each of the stores 2, 4, 6 and sent to the purchase history database 8 periodically, in real time, or at any other time when it is desirable to update the purchase history
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