| http://www.w3.org/ns/prov#value | - s whether there is an error in the set-top box on the basis of the received system state information and requests detailed information on a defective sub-system from the POD in case that there is an error in the set-top box; and a step in which the POD requests detailed information of the defective sub-system from the set-top box, and when detailed information on the defective sub-system is receiv
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