| http://www.w3.org/ns/prov#value | - In step 220, the event processor 150 receives an event start message 192 indicating an identification of the protected site 120, an identification of a sensor 180-1 that detected the event 185 occurring in the protected site 120, and authentication information such as a digital signature or certificate and/or public or symmetric key encryption information contained within the event start message 1
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