| http://www.w3.org/ns/prov#value | - When the token or coupon is presented to a vending machine with a discount device, the discount value of the token or coupon can be ascertained based on the serial number read from the token or coupon. [0014] In another implementation, a discount means including a token or coupon can have a memory element, such as a magnetic strip or a chip, for storing the number of times the purchaser has used t
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