Re: [xsl] XPath expression that generates false plus a message?

[Michael Kay <mike@xxxxxxxxxxxx>]

On 25/04/2011 10:38, Costello, Roger L. wrote:
> Hi Folks,
>
> I want an XPath expression that is an if-then-else:
>
>       If (condition) then
>           true()
>      else
>          false()

Apart from the use of "If" rather than "if", this is a valid XPath 
expression.

> If "condition" is satisfied then return true, else return false. However, in addition to returning false, I want to return a message.
>
> Here's an example that illustrates what I want to do:
>
> ----------------------------------------------------------------------
> if (xs:time(start) gt xs:time(end)) then
>       true()
> else
>       trace(false(), 'Hey, the meeting ends before it begins!')
> ----------------------------------------------------------------------
>
> Unfortunately, that doesn't work. I guess the "else" part is actually returning true.
Your guess is wrong. The else part will always return false.

Please supply a complete working example that demonstrates the problem.

Michael Kay
Saxonica