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(: Test: K-SeqExprCast-718                               :)
(: Written by: Frans Englich                             :)
(: Date: 2006-10-05T18:29:38+02:00                       :)
(: Purpose: Casting from xs:yearMonthDuration to xs:dateTime isn't allowed. :)
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xs:yearMonthDuration("P1Y12M") cast as xs:dateTime