| http://www.w3.org/ns/prov#value | - Examples of substances which are suitable for this purpose are synthetic and natural polymers such as polyvinyl alcohol, which may be partially hydrolyzed, polyvinylpyrrolidone, polyacrylic acid, and acrylic acid copolymerizates with acrylic amide or acrylic esters, water-soluble cellulose derivatives such as hydroxyethyl and hydroxypropyl cellulose, methyl cellulose and carboxymethyl cellulose, g
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