| http://www.w3.org/ns/prov#value | - where n is the valence of A and A is a cation selected from the group consisting of NH.sub.4.sup.+, H.sup.+, Mg.sup.2+, Li.sup.+, Na.sup.+, Ba.sup.2+, Cd.sup.2+, Cu.sup.+, Ca.sup.2+, Cs.sup.+, Fe.sup.2+, Ca.sup.2+, Pb.sup.2+, Mn.sup.2+, Rb.sup.+,
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