| http://www.w3.org/ns/prov#value | - The above-mentioned carboxyl group includes a salt type carboxyl grouprepresented by -COOX, wherein X is an alkali metal (e.g., Li, Na, K and the like), alkaline earth metal (e.g., Be, Mg, Ca, Ba and the like), other metals (e.g., Cu, Zn, Al, Mn, Ag, Fe, Co, Ni and the like), and organic cation such as NH.sub.4, cationicamine and the like.The fiber having a carboxyl group can be produced according
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