| http://www.w3.org/ns/prov#value | - e, the moistening agent includes, for example, polyhydric alcohol such as 1,3-butanediol, 1,5-pentanediol, 1,6-hexanediol, glycerol, 1,2,6-hexanetriol, 1,2,4-butanetriol, 1,2,3-butanetriol, and pentanetriol; nitrogen-containing heterocyclic compound such as N-methyl-2-pyrrolidone, N-hydroxyethyl-2-pyrrolidone, 2-pyrrolidone, 1,3-dimethylimidazolidinone, and ??-caprolactam; amide such as formamide,
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