| http://www.w3.org/ns/prov#value | - The duplication forming/issuing module 309 reads out a UIO from the storage 13 by using the notified object number as a key, and then forms a duplication of this UIO by adding such information as a duplication number, a user ID of a duplication former, and a duplication forming date to the read UIO. FIG. 19 shows an example of a duplicated UIO. Also, when a duplication of the duplicated UIO is for
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