| http://www.w3.org/ns/prov#value | - be the same or different, Y represents a hydroxy group or a hydrolyzable group and, when there are two or more Y groups, they may be the same or different, a represents 0, 1, 2 or 3, b represents 0, 1 or 2 and m is an integer of 0 to 19, provided that the relation a +mb???1 should be satisfied.
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