| http://www.w3.org/ns/prov#value | - It will be appreciated that alternatively the RFID device 18 may be an active device that modulates its impedance only in response to a specific type of signal or signals, for example signals corresponding to certain protocols. [0058] Whether the RFID device 18 is an active device or a passive device, and whether it is a label or a tag, the circuitry of the device 18 may operate in a similar manne
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