| http://www.w3.org/ns/prov#value | - R1 and R2 each are preferably an alkylene or alkenylene group having 1 to 16 carbons, particularly preferably having 1 to 12 carbons, and examples thereof include methylene, ethylene, propylene, trimethylene, tetramethylene, pentamethylene, hexamethylene, heptamethylene, octamethylene, nonamethylene, decamethylene, undecamethylene, dodecamethylene, tridecamethylene, tetradecamethylene, pentadecame
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