| http://www.w3.org/ns/prov#value | - wherein in formula 1 R is any combination of hydrolytically-resistant functional groups, devoid of free OH or NH functional groups; E is a metal or metalloid element from periodic groups 4 and 14 including Si, Ge, Sn, Ti, Zr and Hf; X, Y, and Z are labile groups where the subscript a ranges from 1 to 3 (preferably 3), the value of b, c, and d can each independently range from 0-3 with the requirem
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