| http://www.w3.org/ns/prov#value | - BRIEF DESCRIPTION OF THE DRAWINGS An embodiment or embodiments of the present invention will now be described, by way of example only, with reference to the accompanying drawings, in which: FIG. 1 is a schematic diagram showing the overall method of the present invention; FIG. 2 illustrates a range of products available to a customer; FIG. 3 is a schematic diagram showing the operation of the meth
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