| http://www.w3.org/ns/prov#value | - re defined as follows: ##STR7## wherein R1, R2, R3 and R4 are each a hydrogen atom, halogen atom, alkyl having 1 to 15 carbon atoms, cycloalkyl, phenyl, nucleus-substituted phenyl, aralkyl or nucleus-substituted aralkyl and two of R1, R2, R3 and R4 adjacent to each other may be combined to form a ring, n is an integer of at least 1, and M is a polyvalent metal atom, ##STR8## wherein R5 is alkyl ha
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