| http://www.w3.org/ns/prov#value | - G is an atom of group III (e.g., Al, Ga, In, TI), IV (e.g., C, Si, Ge, Sn, Pb) or V (e.g., N, P, As, Sb, Bi) of the Periodic Table or a group comprising from 2 to 20 carbon atoms, preferably an atom of main group III of the Periodic Table, in particular boron or aluminum, or a partially halogenated or perhalogenated C1-C20-alkyl or C6-C40-aryl group and is particularly preferably an atom of main g
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