| http://www.w3.org/ns/prov#value | - M is an element or a combination of elements selected from the group consisting of Sr, Ca, Ba and Zn; M??? is an element or a combination of elements selected from the group consisting of Mg, Cd and Be; R is one or two of B2O3 and P2O5; Ln is an element or a combination of elements selected from the group consisting of Nd, Dy, Ho, Tm, La, Ce, Er, Pr, Bi, Sm, Sn, Y, Lu, Ga, Sb, Tb, Mn and Pb; Lv is
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