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(: Test: K-DaysFromDurationFunc-4                        :)
(: Written by: Frans Englich                             :)
(: Date: 2006-10-05T18:29:40+02:00                       :)
(: Purpose: A test whose essence is: `days-from-duration(()) instance of xs:integer?`. :)
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days-from-duration(()) instance of xs:integer?