| http://www.w3.org/ns/prov#value | - Shop information 250 is classified according to the shop and product. [0075] Shop information 250 includes various kinds of data indicative of ???shop identifier???, ???product identifier???, ???date???, ???volume of stock???, and ???allowance of reserve??? etc. [0076] ???Shop identifier??? of shop information 250 makes it possible for the management computer 20 to identify each of a plurality of
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