| http://www.w3.org/ns/prov#value | - wherein Y1, Y2, and Y3 each independently represents an alkyl group, preferably a C1 to C8 alkyl group such as methyl, ethyl or propyl or an alkyl group containing a cycloalkyl such as cyclohexyl or cylcopentyl, an aryl group such as phenyl, an alkylaryl group or an aralkyl group, a hydrolyzable group such as for example halogen or alkoxy group such as methoxy, ethoxy or aryloxy group, with at lea
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