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(:Test: op-subtract-yearMonthDuration-from-dateTime-3    :)
(:date: July 5, 2005                                     :)
(:Purpose: Evaluates The string value of "subtract-yearMonthDuration-from-dateTime" :)
(:operator as part of a boolean expression (or operator) and the "fn:boolean" function. :)
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fn:string((xs:dateTime("1999-10-23T13:45:45Z") - xs:yearMonthDuration("P19Y12M"))) or fn:false()