| http://www.w3.org/ns/prov#value | - A computer-implemented method for carrying out an on-line group-buying sale of an item, the method comprising the steps of: conducting the on-line group-buying sale of an item, the item including a price and a non-price attribute; receiving buyer offers in the on-line group-buying sale of the item; transmitting the buyer offers to an e-commerce data processing system; determining the value of the
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