| http://www.w3.org/ns/prov#value | - For example, if p is a pressure sensor, the formula p??{NF, G, UF} means that the pressure sensor p is in mode NF, G or UF. If M is a singleton, e.g. M={NF}, this may also be expressed c=NF. Further, the constant ??? with value false, is a formula.
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