| http://www.w3.org/ns/prov#value | - If you have no mechanism and no observations of that mechanism in action, all you have is a correlation -- which can be used to DISPROVE statements (clearly if you open an umbrella and it does not start raining, you have disproved the statement umbrellas cause rain), but cannot be used to PROVE statements (if you open your umbrella and it starts raining, it does NOT prove the statement umbrellas c
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