| http://www.w3.org/ns/prov#value | - Preferably these components are provided as compounds including but not limited to sodium oxide (Na2O), sodium carbonate (Na2CO3), sodium nitrate (NaNO3), sodium sulphate (Na2SO4), sodium silicates, potassium oxide (K2O), potassium carbonate (K2CO3), potassium nitrate (KNO3), potassium sulphate (K2SO4), potassium silicates, calcium oxide (CaO), calcium carbonate (CaCO3), calcium nitrate (Ca(NO3)2)
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