| http://www.w3.org/ns/prov#value | - Specific examples of the material of the protective layer include metals such as In, Sn, Pb, Au, Cu, Ag, Al, Ti and Ni; metal oxides such as MgO, SiO, SiO.sub.2, Al.sub.2O.sub.3, GeO, NiO, CaO, BaO, Fe.sub.2O.sub.3, Y.sub.2O.sub.3, and TiO.sub.2;
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