| http://www.w3.org/ns/prov#value | - a cap with a first sealing surface formed beneath its periphery, said first sealing surface for contacting a first side of said cover, a body extending from said cap, and a detent extending about the periphery of said body at a free end of said body, said detent including a second sealing surface formed on a side of said detent proximal to said first sealing surface for contacting a second side of
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