| http://www.w3.org/ns/prov#value | - Examples of leaving groups are those having the formula ##STR12## wherein Z is H, R1 or halogen, R1 is an alkyl group having from 1 to 4 carbon atoms, X is 0 or an integer of from 1 to 4 and Y is selected from SO3 M, OSO3 M, CO2 M, N+ (R1)3 O- and N+ (R1)2 --O- wherein M is H, alkali metal, alkaline earth metal, ammonium or substituted ammonium, and O is halide or methosulfate.
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