| http://www.w3.org/ns/prov#value | - oxide or oxide/hydroxide, ##STR1##wherein in formula Ib (enol form) M represents a hydrogen cation, a metal cation such as Li, Na or K, a triethanolamine cation or an ammonium cation optionally substituted by one or more alkyl or substituted alkyl groups each having from 1 to 18C atoms; R.sub.1 represents hydrogen, alkyl with 1 to 12 C atoms or substituted alkyl with 2 to 6 C atoms, wherein the su
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