| http://www.w3.org/ns/prov#value | - ?, HSO4 ???, HSO3 ???, SO4 2???, SO3 2???, CH2SO3 ???, CH3SO3 ???, CH3C6H4SO3 ???, NO3 ???, HCOO???, CH3COO???, HCO3 ???, CO3 2???, H2PO4 ???, HPO4 2???, PO4 3???, SCN???, BF4 ???, ClO4 ???, SSO3 ???, or the like, R is a hydrogen atom or an alkyl group, typically with from 1 to about 8 carbon atoms, and preferably with from 1 to about 3 carbon atoms, m is a integer representing the number of repea
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