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(: Test: K-ConcatFunc-4                                  :)
(: Written by: Frans Englich                             :)
(: Date: 2006-10-05T18:29:39+02:00                       :)
(: Purpose: A test whose essence is: `concat("ab", "c") instance of xs:string`. :)
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concat("ab", "c") instance of xs:string