RE: Merging 2 XML's in to 1 output XML (Performance I

Mike,
      SAXON did improve the performance more than 10 times comparing to
XALAN. I wonder why people are still using XALAN. Are there any specific
areas where XALAN performs better than SAXON??

I have one more question. Is there any difference in performance using
'Saxon-SA' comparing to 'Saxon-B'? Anyhow I will try SAXON-SA in coming
weeks. Good work Mike, your parser is a super fast engine.

David,
     Keys really boosted the performance. Now I can process two 110MB
files within 1 minute. This is un-believable.

The case I have given was simplest but in real time I need to apply some
other conditions. These results are really promising and encouraging for
us.

Thanks for the suggestion and help.

Regards,
Srini


-----Original Message-----
From: David Carlisle [mailto:davidc@xxxxxxxxx]
Sent: Wednesday, October 12, 2005 11:16 AM
To: xsl-list@xxxxxxxxxxxxxxxxxxxxxx
Subject: Re:  Merging 2 XML's in to 1 output XML (Performance
Issue)

> say for each record in InputXSL1 with Key match in InputXSL2 get
                                       ^^^^

The answer is (probably) in your description. You are repeatedly
traversing the other tree to find a st:VehicleTT with the same DFFileId
as the current node. xsl:key is designed to optimise such access 9often
by orders of magnitute).

<xsl:template match="//st:VehicleTT">

You don't want the // there (all it does is change the priority, nit the
nodes matched)

I think you just want
<xsl:stylesheet version="1.0">

<xsl:output method="xml" indent="yes" />

<xsl:variable name="aggregator" select="document('InputXML2.xml')" />

<xsl:template match="/">
	<st:VehicleTDoc>
  		<xsl:apply-templates/>
	</st:VehicleTDoc>
</xsl:template>

<xsl:key name="v" match="st:VehicleTT"
use="concat(xdd:DFFileId,':',xdd:RSNo)"/>

<xsl:template match="st:VehicleTT">
    <st:VehicleTT>
	    <xsl:copy-of select="*"/>
<xsl:variable name="key" select="concat(xdd:DFFileId,':',xdd:RSNo)"/>
<xsl:for-each select="$aggregator">
 <xsl:copy-of select="key('v',$key)/xdd:SName"/>
</xsl:for-each
</xsl:template>

</xsl:stylesheet>


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