| http://www.w3.org/ns/prov#value | - selected from halogen such as fluorine, chlorine, bromine or iodine, chlorine and bromine being particularly preferred; trifluoroacetate, BF4???, PF6??? or SbF6???, C1-C18 alkyl such as methyl, ethyl, n-propyl, iso-propyl, n-butyl, iso-butyl, sec-butyl, tert-butyl, n-pentyl, iso-pentyl, sec-pentyl, neo-pentyl, 1,2-dimethylpropyl, iso-amyl, n-hexyl, iso-hexyl, sec-hexyl, n-heptyl, iso-heptyl, n-oc
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