| http://www.w3.org/ns/prov#value | - ids,such as vinylsulphonic acid, or .alpha.,.beta.-unsaturated monocarboxylic or dicarboxylic acids, for example acrylic, methacrylic, maleic and itaconic acid; derivatives of these .alpha.,.beta.-unsaturated acids which possess acid groups, for example2-acrylamido-2,2-dimethylethanesulphonic acid, and 1- or 2-halogeno-fatty acids, such as 2-chloro-propionic acid and above all chloroacetic acid.
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