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Re: [xsl] current-dateTime()

2008-04-19 02:40:10
On 19/04/2008, Michael Kay <mike(_at_)saxonica(_dot_)com> wrote:
It would be really useful if it returned the actual dateTime
 > at the time of the call so you could implement a progress
 > reporting feature in the transform - you could say how many
 > records were processed in a given time and based on that
 > suggest when the transform might finish.


It wouldn't be as useful as you think. Let's say you use an extension
 function that does this, as has been suggested:

 <xsl:variable name="startTime" select="xx:current-dateTime()"/>
 ... do some processing ...
 <xsl:variable name="endTime" select="xx:current-dateTime()"/>
 <xsl:message select="$endTime - $startTime"/>

 The final result will be a negative duration, because Saxon will evaluate
 $endTime before it evaluates $startTime.

ha, good point - that should be the #1 example for describing what
lazy evaluation is...

It is easy enough though to ensure startTime is evaluated at the start
of processing.


-- 
Andrew Welch
http://andrewjwelch.com
Kernow: http://kernowforsaxon.sf.net/

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