| http://www.w3.org/ns/prov#value | - A computer implemented method useful in applying a constraint in a clock auction, comprising the steps of: Conveying information, including prices for two or more types of items, to at least one bidder, Receiving from said bidder, information for a bid comprising quantities for said types of items, and Applying a constraint to the bid information to require that the sum of the quantities over a gr
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