| http://www.w3.org/ns/prov#value | - Next, in step S1009, the main control unit 200 confirms from the difference thereof whether or not there is an object which has changed between both objects wherein comparison between the current version and previous version has been made, and in a case where the main control unit 200 determines that there is no difference, the main control unit 200 returns to step S1007, where the main control un
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