| http://www.w3.org/ns/prov#value | - A method according to claim 8 wherein A2 has the formula ##STR7## wherein R2 is a single bond or R2 is a divalent aliphatic or alicyclic radical or halogenated derivative thereof containing about 1-12 carbon atoms, --O--, --CO--, --S--, --SO2 --, --O--Q--O--, --S--Q--S-- or --SO2 --Q--SO2 -- and Q is a divalent aliphatic or aromatic radical.
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