op:duration-equal - XPath XQuery Reference

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XPath/XQuery duration-equal function

Summary

Returns true if $arg1 and $arg2 are durations of the same length.

Operator Mapping

Defines the semantics of the "eq" operators when applied to two xs:duration values. Also used in the definition of the "ne" operator.

Signature

op:duration-equal(

$arg1 as xs:duration,
$arg2 as xs:duration

) as xs:boolean

Rules

If the xs:yearMonthDuration components of $arg1 and $arg2 are equal and the xs:dayTimeDuration components of $arg1 and $arg2 are equal, the function returns true.

Otherwise, the function returns false.

The semantics of this function are:

xs:yearMonthDuration($arg1) div xs:yearMonthDuration('P1M')  eq
xs:yearMonthDuration($arg2) div xs:yearMonthDuration('P1M')
    and
xs:dayTimeDuration($arg1) div xs:dayTimeDuration('PT1S')  eq
xs:dayTimeDuration($arg2) div xs:dayTimeDuration('PT1S')

that is, the function returns true if the months and seconds values of the two durations are equal.

The expression op:duration-equal(xs:duration("P1Y"), xs:duration("P12M")) returns true().

The expression op:duration-equal(xs:duration("PT24H"), xs:duration("P1D")) returns true().

The expression op:duration-equal(xs:duration("P1Y"), xs:duration("P365D")) returns false().

The expression op:duration-equal(xs:yearMonthDuration("P0Y"), xs:dayTimeDuration("P0D")) returns true().

The expression op:duration-equal(xs:yearMonthDuration("P1Y"), xs:dayTimeDuration("P365D")) returns false().

The expression op:duration-equal(xs:yearMonthDuration("P2Y"), xs:yearMonthDuration("P24M")) returns true().

The expression op:duration-equal(xs:dayTimeDuration("P10D"), xs:dayTimeDuration("PT240H")) returns true().

The expression op:duration-equal(xs:duration("P2Y0M0DT0H0M0S"), xs:yearMonthDuration("P24M")) returns true().

The expression op:duration-equal(xs:duration("P0Y0M10D"), xs:dayTimeDuration("PT240H")) returns true().

Note that this function, like any other, may be applied to arguments that are derived from the types given in the function signature, including the two subtypes xs:dayTimeDuration and xs:yearMonthDuration. With the exception of the zero-length duration, no instance of xs:dayTimeDuration can ever be equal to an instance of xs:yearMonthDuration.