| http://www.w3.org/ns/prov#value | - FIG. 1 is a block diagram showing an example of construction of a network system to which an embodiment of the invention is applied, FIG. 2 is a diagram showing data transfer sequence useful to explain the operation of the FIG. 1 example, and FIGS. 3A to 3C are diagrams showing examples of routing tables used in the FIG. 1 example.
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