| http://www.w3.org/ns/prov#value | - Preferable examples of M2 include in addition to a hydrogen atom, as the metal element, Li, Na, K, Mg, Ti, Zr, V, Nb, Ta, Cr, Mo, W, Mn, Fe, Co, Ni, Ru, Rh, Pd, Os, Ir, Pt, Cu, Ag, Au, Zn, Cd, Hg, Al, Ga, In, Si, Ge, Sn, Pb, Sb, Bi or the like other than a hydrogen atom.
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