Everyone looking at your code is immediately struck by the horrible use
of disable-output-escaping to write tags. But that's distracting people
from the real problem, which is:
<xsl:when test="unit=preceding::unit">
<xsl:choose>
<xsl:when test="schedule=preceding::schedule">
The preceding axis is very expensive, it has O(n^2) performance because
it searches the entire document up to the context node. I don't have
time to study your problem and suggest anything better, but the answer
is usually one or more of:
* use preceding-sibling
* use preceding::x[1]
* use keys
Michael Kay
Software AG
home: Michael(_dot_)H(_dot_)Kay(_at_)ntlworld(_dot_)com
work: Michael(_dot_)Kay(_at_)softwareag(_dot_)com
-----Original Message-----
From: owner-xsl-list(_at_)lists(_dot_)mulberrytech(_dot_)com
[mailto:owner-xsl-list(_at_)lists(_dot_)mulberrytech(_dot_)com] On Behalf Of
Eric Barre
Sent: 14 April 2003 19:02
To: XSL-List(_at_)lists(_dot_)mulberrytech(_dot_)com
Cc: Eric Barre
Subject: [xsl] Optimizing a XSLT
Hi,
I wrote a XSL file to transform a XML file to another XML
file, everything works fine on small file but eventually I
will be using it against large XML file (over 1mg). When I
run it against such a large file it takes for ever to return,
I mean I have to kill it after running for an hour. Is there
a way to optimize the XSL that I have to make it perform
better? Here is the 'input' XML:
<CSVFile>
<ROW>
<unit>DOUG_1</unit>
<schedule>101</schedule>
<textdate>2003-04-09</textdate>
<texthour>18</texthour>
<mw>999999</mw>
<price>16.09</price>
<ScheduleType>Cost</ScheduleType>
<MarketAvailability>RealTime</MarketAvailability>
</ROW>
<ROW>
<unit>DOUG_1</unit>
<schedule>199</schedule>
<textdate>2003-04-09</textdate>
<texthour>18</texthour>
<mw>999999</mw>
<price>0.00</price>
<ScheduleType>Cost</ScheduleType>
<MarketAvailability>RealTime</MarketAvailability>
</ROW>
<ROW>
<unit>ERIC_1</unit>
<schedule>201</schedule>
<textdate>2003-04-09</textdate>
<texthour>18</texthour>
<mw>0</mw>
<price>10.79</price>
<ScheduleType>Cost</ScheduleType>
<MarketAvailability>RealTime</MarketAvailability>
</ROW>
<ROW>
<unit>ERIC_1</unit>
<schedule>201</schedule>
<textdate>2003-04-09</textdate>
<texthour>18</texthour>
<mw>18</mw>
<price>21.59</price>
<ScheduleType>Cost</ScheduleType>
<MarketAvailability>RealTime</MarketAvailability>
</ROW>
</CSVFile>
The XSL:
<?xml version="1.0" encoding="UTF-8"?>
<xsl:stylesheet version="1.0"
xmlns:xsl="http://www.w3.org/1999/XSL/Transform";>
<xsl:output method="xml" indent="no"/>
<xsl:template match="/">
<SubmitRequest>
<xsl:call-template name="RowProcess"/>
<xsl:text
disable-output-escaping="yes"></PriceCurvehourly></xsl:text>
<xsl:text
disable-output-escaping="yes"></OfferPriceCurve></xsl:text>
<xsl:text
disable-output-escaping="yes"><ScheduleType></xsl:text>
<xsl:value-of select="CSVFile/ROW/ScheduleType"/>
<xsl:text
disable-output-escaping="yes"></ScheduleType></xsl:text>
<xsl:text
disable-output-escaping="yes"><MarketAvailability></xsl:text>
<xsl:value-of select="CSVFile/ROW/MarketAvailability"/>
<xsl:text
disable-output-escaping="yes"></MarketAvailability></xsl:text>
<xsl:text
disable-output-escaping="yes"></UnitScheduleOffer></xsl:text>
</SubmitRequest>
</xsl:template>
<!--Processing-->
<xsl:template name="RowProcess">
<xsl:for-each select="/CSVFile/ROW">
<xsl:call-template name="UnitProcess"/>
</xsl:for-each>
</xsl:template>
<xsl:template name="UnitProcess">
<xsl:call-template name="unit"/>
</xsl:template>
<xsl:template name="unit">
<xsl:choose>
<xsl:when test="unit=preceding::unit">
<xsl:choose>
<xsl:when test="schedule=preceding::schedule">
<xsl:call-template name="PricePointProcess"/>
</xsl:when>
<xsl:otherwise>
<xsl:call-template name="NewUnit"/>
<xsl:call-template name="PricePointProcess"/>
</xsl:otherwise>
</xsl:choose>
</xsl:when>
<xsl:otherwise>
<xsl:call-template name="NewUnit"/>
<xsl:call-template name="PricePointProcess"/>
</xsl:otherwise>
</xsl:choose>
</xsl:template>
<xsl:template name="NewUnit">
<xsl:choose>
<xsl:when test="position()!=1">
<xsl:text
disable-output-escaping="yes"></PriceCurvehourly></xsl:text>
<xsl:text
disable-output-escaping="yes"></OfferPriceCurve></xsl:text>
<xsl:text
disable-output-escaping="yes"><ScheduleType></xsl:text>
<xsl:value-of select="ScheduleType"/>
<xsl:text
disable-output-escaping="yes"></ScheduleType></xsl:text>
<xsl:text
disable-output-escaping="yes"><MarketAvailability></xsl:text>
<xsl:value-of select="MarketAvailability"/>
<xsl:text
disable-output-escaping="yes"></MarketAvailability></xsl:text>
<xsl:text
disable-output-escaping="yes"></UnitScheduleOffer></xsl:
text>
</xsl:when>
</xsl:choose>
<xsl:text disable-output-escaping="yes"><UnitScheduleOffer
unit="</xsl:text>
<xsl:value-of select="unit"/>
<xsl:text disable-output-escaping="yes">" schedule="</xsl:text>
<xsl:value-of select="schedule"/>
<xsl:text disable-output-escaping="yes">" day="</xsl:text>
<xsl:value-of select="textdate"/>
<xsl:text disable-output-escaping="yes">"></xsl:text>
<xsl:text
disable-output-escaping="yes"><OfferPriceCurve></xsl:text>
<xsl:text disable-output-escaping="yes"><PriceCurvehourly
hour="</xsl:text>
<xsl:value-of select="texthour"/>
<xsl:text disable-output-escaping="yes">"></xsl:text>
</xsl:template>
<xsl:template name="PricePointProcess">
<xsl:text disable-output-escaping="yes"><PricePoint
MW="</xsl:text>
<xsl:value-of select="mw"/>
<xsl:text disable-output-escaping="yes">" price="</xsl:text>
<xsl:value-of select="price"/>
<xsl:text disable-output-escaping="yes">"/></xsl:text>
</xsl:template>
</xsl:stylesheet>
and the expected output:
<?xml version="1.0" encoding="UTF-8"?>
<SubmitRequest>
<UnitScheduleOffer unit="DOUG_1" schedule="101" day="2003-04-09">
<OfferPriceCurve>
<PriceCurvehourly hour="18">
<PricePoint MW="0" price="8.04"/>
<PricePoint MW="68" price="16.09"/>
<PricePoint MW="999999" price="16.09"/>
</PriceCurvehourly>
</OfferPriceCurve>
<ScheduleType>Cost</ScheduleType>
<MarketAvailability>RealTime</MarketAvailability>
</UnitScheduleOffer>
<UnitScheduleOffer unit="DOUG_1" schedule="199" day="2003-04-09">
<OfferPriceCurve>
<PriceCurvehourly hour="18">
<PricePoint MW="999999" price="0.00"/>
</PriceCurvehourly>
</OfferPriceCurve>
<ScheduleType>Cost</ScheduleType>
<MarketAvailability>RealTime</MarketAvailability>
</UnitScheduleOffer>
<UnitScheduleOffer unit="ERIC_1" schedule="201" day="2003-04-09">
<OfferPriceCurve>
<PriceCurvehourly hour="18">
<PricePoint MW="0" price="10.79"/>
<PricePoint MW="18" price="21.59"/>
<PricePoint MW="999999" price="21.59"/>
</PriceCurvehourly>
</OfferPriceCurve>
<ScheduleType>Cost</ScheduleType>
<MarketAvailability>RealTime</MarketAvailability>
</UnitScheduleOffer>
</SubmitRequest>
After reading some posting I tried to stay away from the
<xsl:for-each> as much as possible as well as using variables
and parameters. If anyone could let me know a way to optimize
this I would appreciate it.
Thanks,
Eric Barre
XSL-List info and archive: http://www.mulberrytech.com/xsl/xsl-list
XSL-List info and archive: http://www.mulberrytech.com/xsl/xsl-list