| http://www.w3.org/ns/prov#value | - nsubstituted alkylene group having from 1 to 20 carbon atoms, such as ethylene group, propylene group and butylene group.In formula (B), X.sup.+ represents a cation and examples thereof include metal ions (e.g., Na.sup.+, K.sup.+), ammonium ions (for example, ion represented by HN.sup.+ (C.sub.2 H.sub.5).sub.3) and pyridinium ion.Specific examples of the compound represented by formula (B) are set
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