(:*******************************************************:)
(: Test: K-SeqExprCast-697                               :)
(: Written by: Frans Englich                             :)
(: Date: 2006-10-05T18:29:38+02:00                       :)
(: Purpose: An empty string is not a valid lexical representation of xs:yearMonthDuration. :)
(:*******************************************************:)
xs:yearMonthDuration("")