| http://www.w3.org/ns/prov#value | - In addition, Y represents the following bivalent groups: ##STR1443## in which R.sup.3, R.sup.4, R.sup.5 and R.sup.6 are each independently an alkyl group which may have a substituent, an aryl group which may have a substituent, ora halogen atom; a and b are each independently an integer of 0 to 4; c and d are each independently an integer of 0 to 3; and m is an integer of 0 or 1, and when m=1, Z i
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