| http://www.w3.org/ns/prov#value | - wherein X??? and Y??? are the same or different and are each independently a counter anion selected from the group consisting of an halogen anion, CIO4???, BF4???, PF6???, CH3COO??? and CH3(C6H4)SO3???, R1 is hydrogen or a C1-C5 alkyl group, R2 is a C1-C30 divalent hydrocarbon or oxygen-containing hydrocarbon group, R3 is a C1-C20 hydrocarbon or oxygen-containing hydrocarbon group and a is an inte
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