RE: [xsl] Source Reducer

Subject: RE: [xsl] Source Reducer
From: <tomas.vanek@xxxxxxxxxxxxx>
Date: Mon, 6 Jun 2005 18:25:56 +0200
The reduction according the ancestor count (wihout "mode"):
 <xsl:template match="@*">
	<xsl:copy-of select=./>

 <xsl:template match="node()">
   <xsl:param name="level>1</xsl:param>

	<xsl:apply-templates select="@*"/>
	<xsl:if test="$level &lt; 4">
		<xsl:apply-templates select="node()">
			<xsl:with-param name="level" select="$level +

<!-- ..... -->


-----Original Message-----
From: Andrew Welch [mailto:ajwelch@xxxxxxxxxxxxxxx]
Sent: Monday, June 06, 2005 6:03 PM
To: xsl-list@xxxxxxxxxxxxxxxxxxxxxx
Subject: RE: [xsl] Source Reducer

> I have a source xml which is 19MB +  I'm running the following "source

> reducer" template against it using the
> MSXML4 parser, however it is slow (has been running well over
> 2 min. now).  Any suggestions on how to optimize this source reducer
> template?  Also, how does the ancestor match below work, what does it
> do exactly?
> <xsl:strip-space elements="*"/>
>  <xsl:template match="node()|@*">
>    <xsl:copy>
>      <xsl:apply-templates select="node()|@*"/>
>    </xsl:copy>
>  </xsl:template>
>  <xsl:template match="/*/*[position() > 20]"/>
>  <xsl:template match="*[ancestor::*[3]]"/>

The final no-op template will match any element with 3 ancestors - it
means the result tree will be no more than 3 deep.

To improve performance you need to replace the use of the ancestor axis
with something else... but the only thing that instantly springs to mind
is to use modes eg:

 <xsl:template match="node()|@*">
     <xsl:apply-templates select="node()|@*" mode="second"/>

 <xsl:template match="node()|@*" mode="second">
     <xsl:apply-templates select="node()|@*" mode="stop"/>

 <xsl:template match="node()" mode="stop"/>

I'm sure there is a better way...

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