| http://www.w3.org/ns/prov#value | - Mx Ay wherein M is an alkali or alkaline earth metal, Cu, Zn, B, Al, Si, Ti, Zr, V, Cr, Mo, W, U, Fe, Co, or Ni and A is an electronegative element or -- O --, -- OH, -- Or, wherein R is alkyl or aryl, x is 1 or 2 and y is an integer of 1 to 5.
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