| http://www.w3.org/ns/prov#value | - Other useful complexing agents may be formed of acids, such as citric, lactic, malonic, tartaric, succinic, malic, acetic and oxalic acid, as well as amino acids, sulfamic and amino sulfuric acids, phosphoric acids, phosphonic acids, 2-quinoline carboxylic acid, and their salts.
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