http://www.w3.org/ns/prov#value | - hich is unsubstituted or substituted by halogen atoms or nitro groups, X is O, S or NR10, R10 being a hydrogen atom or a C1 -C6 alkyl or phenyl which is unsubstituted or substituted by halogen atoms or nitro groups, and Y is a radical of the following formulae ##STR6## in which R11 is a hydrogen atom or a C1 -C6 alkyl or phenyl which is unsubstituted or substituted by halogen atoms or nitro groups
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