| http://www.w3.org/ns/prov#value | - Items or commodities are defined to be heterogeneous when there are two or more types of items. [0038] The various embodiments of the present invention tend to be the most useful when the items are heterogeneous (so that the system and method for a dynamic auction of homogeneous commodities, described in U.S. Pat. No. 6,026,383, does not apply), but nevertheless there is some connection or relatio
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