| http://www.w3.org/ns/prov#value | - --X(OR)n OSiR'a (OR)3-a wherein X represents a divalent hydrocarbon group having from 2 to 8 inclusive carbon atoms, R represents an alkylene group having from 2 to 4 inclusive carbon atoms, n is an integer of at least 2, R' represents an alkyl group having from 1 to 8 inclusive carbon atoms, a vinyl group, an allyl group or a phenyl group, R represents an alkyl or an alkoxyalkyl group having le
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