http://www.w3.org/ns/prov#value | - le occurrence (step S16). [0101] Moreover, the vendor-side computer 26 reports the trouble occurrence and the status to the worker at the vendor side via the input/output device 31 of the vendor-side computer 26, and reads contact information such as an e-mail address of a (person) in charge of maintenance at the vendor-side from the contact information database 34, and informs the person in charg
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