| http://www.w3.org/ns/prov#value | - wherein R1 is selected from the group consisting essentially of H; an alkyl group of 1 to 8 carbon atoms; a hydroxyalkyl group of 1 to 8 carbon atoms and Xn (CH2 CH2 O)m --R4 wherein n=0 or 1, X is an alkyl, aryl or alkaryl diradical connecting group of 1 to 9 carbon atoms, m is 2 to 50, and R4 is H or an alkyl group of 1 to 4 carbon atoms.
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