| http://www.w3.org/ns/prov#value | - The first user 1802 and the second user 1804 may each have associated with them a shared criteria 1808 (e.g., the shared criteria may be a common transaction on the network based trading platform 12 of FIG. 2, and/or an attribute such as geographical location, purchase volume, category of purchase, and/or trading expertise).
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