| http://www.w3.org/ns/prov#value | - Call: (1) An option contract that gives the buyer the right but not the obligation to purchase a commodity or other asset or to enter into a long futures position at a specified price on or prior to a specified expiration date; (2) formerly, a period at the opening and the close of some futures markets in which the price for each futures contract was established by auction; or (3) the requirement
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