| http://www.w3.org/ns/prov#value | - When the token or coupon is presented to a vending machine with a discount function, the discount value of the token or coupon can be ascertained by reading the serial number. [0037] In another implementation, a discount means, a token, a coupon or a card, can have a memory element, such as a memory chip or a magnetic strip, on the discount means for reading the number of vend purchases made and t
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