Subject: Re: XPath expression that generates false plus a message?
From: Michael Kay <mike@xxxxxxxxxxxx>
Date: Wed, 25 May 2011 09:28:53 +0100
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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
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