| http://www.w3.org/ns/prov#value | - Such semipermeable polymers will desirably include, for example, cellulose acylates, acetates, and other semipermeable polymers such as those described in U.S. Pat. No. 4,285,987, as well as the selectively permeable polymers formed by the coprecipitation of a polycation and a polyanion as disclosed in U.S. Pat. Nos. 3,173,876; 3,276,586; 3,541,005; 3,541,006 and 3,546,142.
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