| http://www.w3.org/ns/prov#value | - This presence is kind of like hopping out of the car to stand in a parking space so no one nabs it while your friend drives around the block. (Our friend in this metaphor would be the as-of-yet nonexistent technology to cost-effectively extract minerals or hydrocarbons from Antarctica.) Now, imagine all the trouble that would arise if there were a bunch of people standing around in parking spaces,
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