| http://www.w3.org/ns/prov#value | - eO--MRa Xb where e represents the oxide surface; O is oxygen; M is a metal or metalloid such as silicon, each R is any alkyl, aryl, arylalkyl, alkoxy or aryloxy group, a is a number from 1 through 3, X is any halogen or hydroxyl group b, is a number from 0 through 2, and a+b=3.
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