| http://www.w3.org/ns/prov#value | - Preferably, the indicators are visible and/or audible, such as, an indicator lamp (e.g., a light emitting diode (LED)) that lights, for example, when a robot is lost, and an aural indicator via a speaker, such as a beep or other tone, that sounds periodically until the robot or an operator corrects the robot and puts it back on the correct pathway.
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