| http://www.w3.org/ns/prov#value | - Although it is not particularly limited, examples of such a material include metal oxide such as vanadium oxide (V2O5), titanium oxide (Ti02), tin oxide (SnO2), tungstite (WO3) and niobium oxide (Nb2O3), and metal sulfide such as cadmium sulfide (CdS) and the like.
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