| http://www.w3.org/ns/prov#value | - metal or an alkaline earth metal such as for example but not limited to sodium, potassium and magnesium, C1-6 hydroxyalkyl such as for example but not limited to hydroxyethyl, hydroxypropyl and hydroxybutyl, C4-12 hydroxyalkoxyalkyl such as for example but not limited to hydroxyethoxyethyl, hydroxybutoxybutyl and hydroxymethoxypropyl, C4-12 hydroxydialkoxyalkyl such as for example but not limited
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