| http://www.w3.org/ns/prov#value | - Preferably, M has the formula ##STR1## wherein R is alkyl usually having 1 to 4 carbon atoms; --SO2 R1 wherein R1 is alkyl usually having 1 to 6 carbon atoms; phenyl; naphthyl; or phenyl substituted with alkyl usually having 1 to 6 carbon atoms, alkoxy usually having 1 to 6 carbon atoms, halo, such as chloro or bromo, trihalomethyl, such as, trichloromethyl or trifluoromethyl, cyano, nitro, carbox
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