[xsl] Recording start and end time of processing (in pipeline)

I have a quite complex XSLT sheet that processes some large amount data.
I'd like to record the start and end processing times in the output, so
that I can do rudimentary profiling of the work done.

I've noticed however that in the following sort of scenario (pipeline
processing using variables to store intermediary steps), I end up
getting the exact same start and end times.

<xsl:template name="process">
        <xsl:variable name="start" select="current-dateTime()"/>

        <xsl:variable name="step1">
                <!-- some processing -->
        </xsl:variable>

        <xsl:variable name="step2">
                <!-- some processing on step1 -->
        </xsl:variable>

        <xsl:variable name="end" select="current-dateTime()"/>

        <xsl:result-document>
                <process start="{$start}" end="{$end}">
                        <xsl:sequence select="$step2"/>
                </process>
        </xsl:result-document>
</xsl:template>

I fully understand why (xsl processor evaluating only when necessary),
but wonder how I could get it working.

Fabre Lambeau
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