| http://www.w3.org/ns/prov#value | - R.sup.4, with the proviso that R.sup.2 is not hydrogen when A is a bond, or (ii) when A is C.sub.2 -C.sub.3 alkylene, --NR.sup.8 R.sup.9, --OR.sup.3, --COOR.sup.3, --OCOR.sup.4, --SO.sub.2 R.sup.4, --CN, --SO.sub.2 NR.sup.3 R.sup.3, --NR.sup.3 COR.sup.4
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