| http://www.w3.org/ns/prov#value | - However, any suitable type of detection device, including but not limited to emitters and/or detectors of passive infrared energy, ultrasonic energy, passive magnetic fields (detecting the coils of the card using a magnetic sensor), or sensors combined with electronics to sense changes in capacitance, inductance, or electrical charge, can be used for determining if a proximity card is present.
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