| http://www.w3.org/ns/prov#value | - For example, phosphates such as KH2PO4, K2HPO4, NaH2PO4, and Na5HPO4, inorganic nitrogen compounds such as ammonium sulfate, ammonium nitrate and urea, various salts of metal ions such as magnesium, sodium, potassium and calcium ions, various salts such as the sulfates, hydrochlorides, carbonates and the like of trace metal ions such as manganese, zinc, iron and cobalt ions, and vitamins may be co
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