| http://www.w3.org/ns/prov#value | - Exemplary operations in box 90 can include waveform comparison, e.g. between sensed time-varying waveforms or between a sensed time-varying waveform and a reference waveform, and/or a transforming operation or other operation that obtains a periodicity value such as a frequency or wavelength, using techniques as described, for example, in co-pending U.S. patent application Ser.
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