| http://www.w3.org/ns/prov#value | - DETAILED DESCRIPTION OF A PREFERRED EMBODIMENT OF THE INVENTION [0023] Referring now to the drawings and in particular to FIG. 1, there is shown an embodiment of this invention which permits a purchaser or user, using his/her client system 10, to access a server system 18 by exchanging messages over a communication link 16, which in one example of this invention may take the form of the Internet.
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