| http://www.w3.org/ns/prov#value | - wherein:R.sub.1 is a hydrogen atom, an alkyl group with 1.about.18 carbon atoms, a cycloalkyl group with 3.about.10 carbon atoms, an aryl group, a hydroxyalkyl group with 1.about.8 carbon atoms, a --(CH.sub.2).sub.m NR.sub.2 R.sub.3 group, or a--(C.sub.2 H.sub.4 O).sub.n R.sub.4 group, wherein: R.sub.2 and R.sub.3 are linear or branched alkyl groups with 1.about.8 carbon atoms; R.sub.4 is a linear
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