On Fri, 17 Jun 2011, G. Ken Holman wrote:
> At 2011-06-17 17:58 +0000, Will Thompson wrote:
> xs:boolean does a cast of the argument. The first bullet of the
> documentation cites what is returned when the argument is an empty set:
>
> http://www.w3.org/TR/2007/REC-xpath-functions-20070123/#func-boolean
So per specs, xs:boolean(()) should return "false" as a boolean.
However, that's not the behavior in MarkLogic. Version "0.9-ml" throws
an error, "Invalid cast". Versions 1.0 and 1.0-ml return empty sequence.
(For what it's worth, Saxon 9.3 returns empty sequence as well.)
In most cases, having a return value of empty sequence versus boolean
false probably won't affect expected results, but there are differences.
For example, Marklogic evaluates
empty(false()) ==> false
empty(xs:boolean(())) ==> true
whereas the XPath specs suggest both should return "false"?
DS
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David Sewell, Editorial and Technical Manager
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