| http://www.w3.org/ns/prov#value | - ; and l is an integer of 0 or 1, and when l=1, X is a straight-chain alkylene group having 2 to 12 carbon atoms, a branched alkylene group having 3 to 12 carbon atoms, a bivalent group having at least one alkylene group with 1 to 10 carbon atoms and at least one atom selected from the group consisting of an oxygen atom and a sulfur atom, ???C???, ???S???, ???SO???, ???SO2???, ???CO???, in which Z1
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