| http://www.w3.org/ns/prov#value | - The fields specify: (i) a requested product category 505 that identifies the product or product category requested by the customer; (ii) an identifier 510 that identifies a substitute product to be displayed; (iii) a payment 515 which the manufacturer or other seller has agreed to pay upon display of the substitute product; (iv) a payment 520 which the manufacturer or other seller has agreed to pa
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