| http://www.w3.org/ns/prov#value | - up, or an alkyl, alkenyl, or alkynyl containing acyl group; R6 is an alkyl group, an alkenyl group, an alkynyl group, or an acyl containing group all from 1 to 10 carbons, preferably a methyl group; R7 is an alkyl group, an alkenyl group, an alkynyl group, or an acyl containing group all from 1 to 10 carbons, preferably a methyl group; and X- is an anion, usually an oxyanion or halide counterion.
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