| http://www.w3.org/ns/prov#value | - In one or more embodiments, the purchasing system device 5900 may store in memory 5930 a seller database, such as seller database 1000 illustrated in FIG. 10A. The purchasing system device 5900 may use the seller database 1000 to determine the seller type (i.e., whether the seller is a manufacturer or a retailer) and other information pertaining to a seller (such as the seller address for offer ro
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