| http://www.w3.org/ns/prov#value | - The following specific examples may be used: partially hydrolyzed polyacrylonitrile in which the conversion degree is above 5% of the acrylonitrile units, sparsely cross-linked poly-hydroxyethyl methacrylate (poly-HEMA) or acrylate, copolymers of hydroxyethyl methacrylate with alkyl acrylates and -methacrylates (alkyls with C1 to C6 and cross-linked with agents such as ethylene glycol or di-ethyle
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