| http://www.w3.org/ns/prov#value | - Therein, the metal represented by Mt can be a monovalent, divalent or trivalent metal, and is, for example, an alkali metal, such as lithium, sodium, potassium and the like, an alkaline earth metal, such as magnesium, calcium and the like, or an earth metal, such as boron, aluminum and the like.
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